diff --git a/api_browser.py b/api_browser.py
index 5025907..4a76a1d 100755
--- a/api_browser.py
+++ b/api_browser.py
@@ -117,7 +117,11 @@ def get_cookie_jar_path(username: str) -> str:
     """获取截图用的 cookies 文件路径（Netscape Cookie 格式）"""
     import hashlib
 
-    os.makedirs(COOKIES_DIR, exist_ok=True)
+    os.makedirs(COOKIES_DIR, mode=0o700, exist_ok=True)
+    try:
+        os.chmod(COOKIES_DIR, 0o700)
+    except Exception:
+        pass
     filename = hashlib.sha256(username.encode()).hexdigest()[:32] + ".cookies.txt"
     return os.path.join(COOKIES_DIR, filename)
 
@@ -260,6 +264,10 @@ class APIBrowser:
 
             with open(cookies_path, "w", encoding="utf-8") as f:
                 f.write("\n".join(lines) + "\n")
+            try:
+                os.chmod(cookies_path, 0o600)
+            except Exception:
+                pass
 
             self.log(f"[API] Cookies已保存供截图使用")
             return True
diff --git a/app.py b/app.py
index 831b28a..be6f0a2 100644
--- a/app.py
+++ b/app.py
@@ -212,11 +212,12 @@ def enforce_csrf_protection():
         return
     if request.path.startswith("/static/"):
         return
-    # 登录相关路由豁免 CSRF 检查（登录本身就是建立 session 的过程）
+    # 登录挑战相关路由豁免 CSRF（会话尚未建立前需要可用）
     csrf_exempt_paths = {
         "/yuyx/api/login",
         "/api/login",
         "/api/auth/login",
+        "/api/generate_captcha",
         "/yuyx/api/passkeys/login/options",
         "/yuyx/api/passkeys/login/verify",
         "/api/passkeys/login/options",
@@ -224,8 +225,6 @@ def enforce_csrf_protection():
     }
     if request.path in csrf_exempt_paths:
         return
-    if not (current_user.is_authenticated or "admin_id" in session):
-        return
     token = request.headers.get("X-CSRF-Token") or request.form.get("csrf_token")
     if not token or not validate_csrf_token(token):
         return jsonify({"error": "CSRF token missing or invalid"}), 403
diff --git a/app_config.py b/app_config.py
index a842447..ebe27f3 100755
--- a/app_config.py
+++ b/app_config.py
@@ -33,6 +33,23 @@ except ImportError:
 SECRET_KEY_FILE = "data/secret_key.txt"
 
 
+def _ensure_private_dir(path: str) -> None:
+    if not path:
+        return
+    os.makedirs(path, mode=0o700, exist_ok=True)
+    try:
+        os.chmod(path, 0o700)
+    except Exception:
+        pass
+
+
+def _ensure_private_file(path: str) -> None:
+    try:
+        os.chmod(path, 0o600)
+    except Exception:
+        pass
+
+
 def get_secret_key():
     """获取SECRET_KEY（优先环境变量）"""
     # 优先从环境变量读取
@@ -42,14 +59,16 @@ def get_secret_key():
 
     # 从文件读取
     if os.path.exists(SECRET_KEY_FILE):
+        _ensure_private_file(SECRET_KEY_FILE)
         with open(SECRET_KEY_FILE, "r") as f:
             return f.read().strip()
 
     # 生成新的
     new_key = os.urandom(24).hex()
-    os.makedirs("data", exist_ok=True)
+    _ensure_private_dir("data")
     with open(SECRET_KEY_FILE, "w") as f:
         f.write(new_key)
+    _ensure_private_file(SECRET_KEY_FILE)
     print(f"[OK] 已生成新的SECRET_KEY并保存到 {SECRET_KEY_FILE}")
     return new_key
 
@@ -203,7 +222,7 @@ class Config:
     SERVER_PORT = int(os.environ.get("SERVER_PORT", "51233"))
 
     # ==================== SocketIO配置 ====================
-    SOCKETIO_CORS_ALLOWED_ORIGINS = os.environ.get("SOCKETIO_CORS_ALLOWED_ORIGINS", "*")
+    SOCKETIO_CORS_ALLOWED_ORIGINS = os.environ.get("SOCKETIO_CORS_ALLOWED_ORIGINS", "")
 
     # ==================== 网站基础URL配置 ====================
     # 用于生成邮件中的验证链接等
diff --git a/app_security.py b/app_security.py
index 7b1b5b9..f281526 100755
--- a/app_security.py
+++ b/app_security.py
@@ -9,6 +9,7 @@ import os
 import re
 import time
 import hashlib
+import hmac
 import secrets
 import ipaddress
 import socket
@@ -78,7 +79,13 @@ def sanitize_filename(filename):
 class IPRateLimiter:
     """IP访问频率限制器"""
 
-    def __init__(self, max_attempts=10, window_seconds=3600, lock_duration=3600):
+    def __init__(
+        self,
+        max_attempts=10,
+        window_seconds=3600,
+        lock_duration=3600,
+        max_tracked_ips=20000,
+    ):
         """
         初始化限流器
 
@@ -90,6 +97,7 @@ class IPRateLimiter:
         self.max_attempts = max_attempts
         self.window_seconds = window_seconds
         self.lock_duration = lock_duration
+        self.max_tracked_ips = max(1000, int(max_tracked_ips or 0))
 
         # IP访问记录: {ip: [(timestamp, success), ...]}
         self._attempts = defaultdict(list)
@@ -97,6 +105,47 @@ class IPRateLimiter:
         self._locked = {}
         self._lock = threading.Lock()
 
+    def _prune_if_oversized(self, now_ts: float) -> None:
+        """限制内部映射大小，避免在高频随机IP攻击下持续膨胀。"""
+        tracked = len(self._attempts) + len(self._locked)
+        if tracked <= self.max_tracked_ips:
+            return
+
+        cutoff_time = now_ts - self.window_seconds
+        for ip in list(self._attempts.keys()):
+            self._attempts[ip] = [
+                (ts, succ) for ts, succ in self._attempts[ip]
+                if ts > cutoff_time
+            ]
+            if not self._attempts[ip]:
+                del self._attempts[ip]
+
+        for ip in list(self._locked.keys()):
+            if now_ts >= self._locked[ip]:
+                del self._locked[ip]
+
+        tracked = len(self._attempts) + len(self._locked)
+        if tracked <= self.max_tracked_ips:
+            return
+
+        # 优先按“最近访问时间最早”淘汰 attempts 中的 IP 记录。
+        overflow = tracked - self.max_tracked_ips
+        oldest = []
+        for ip, attempt_items in self._attempts.items():
+            if attempt_items:
+                oldest.append((attempt_items[-1][0], ip))
+            else:
+                oldest.append((0.0, ip))
+        oldest.sort(key=lambda item: item[0])
+
+        removed = 0
+        for _, ip in oldest:
+            self._attempts.pop(ip, None)
+            self._locked.pop(ip, None)
+            removed += 1
+            if removed >= overflow:
+                break
+
     def is_locked(self, ip_address):
         """
         检查IP是否被锁定
@@ -129,6 +178,7 @@ class IPRateLimiter:
         """
         with self._lock:
             now = time.time()
+            self._prune_if_oversized(now)
 
             # 清理过期记录
             cutoff_time = now - self.window_seconds
@@ -357,7 +407,19 @@ def generate_csrf_token():
 
 def validate_csrf_token(token):
     """验证CSRF令牌"""
-    return token == session.get('csrf_token')
+    expected = session.get("csrf_token")
+    if (token is None) or (expected is None):
+        return False
+
+    provided_text = str(token or "")
+    expected_text = str(expected or "")
+    if (not provided_text) or (not expected_text):
+        return False
+
+    return hmac.compare_digest(
+        provided_text.encode("utf-8"),
+        expected_text.encode("utf-8"),
+    )
 
 
 # ==================== 内容安全 ====================
diff --git a/crypto_utils.py b/crypto_utils.py
index b937aad..cb8cee6 100644
--- a/crypto_utils.py
+++ b/crypto_utils.py
@@ -14,6 +14,7 @@
 import os
 import sys
 import base64
+import threading
 from pathlib import Path
 from cryptography.fernet import Fernet
 from cryptography.hazmat.primitives import hashes
@@ -27,18 +28,37 @@ ENCRYPTION_KEY_FILE = os.environ.get('ENCRYPTION_KEY_FILE', 'data/encryption_key
 ENCRYPTION_SALT_FILE = os.environ.get('ENCRYPTION_SALT_FILE', 'data/encryption_salt.bin')
 
 
+def _ensure_private_dir(path: Path) -> None:
+    if not path:
+        return
+    os.makedirs(path, mode=0o700, exist_ok=True)
+    try:
+        os.chmod(path, 0o700)
+    except Exception:
+        pass
+
+
+def _ensure_private_file(path: Path) -> None:
+    try:
+        os.chmod(path, 0o600)
+    except Exception:
+        pass
+
+
 def _get_or_create_salt():
     """获取或创建盐值"""
     salt_path = Path(ENCRYPTION_SALT_FILE)
     if salt_path.exists():
+        _ensure_private_file(salt_path)
         with open(salt_path, 'rb') as f:
             return f.read()
 
     # 生成新的盐值
     salt = os.urandom(16)
-    os.makedirs(salt_path.parent, exist_ok=True)
+    _ensure_private_dir(salt_path.parent)
     with open(salt_path, 'wb') as f:
         f.write(salt)
+    _ensure_private_file(salt_path)
     return salt
 
 
@@ -102,6 +122,7 @@ def get_encryption_key():
     key_path = Path(ENCRYPTION_KEY_FILE)
     if key_path.exists():
         logger.info(f"从文件 {ENCRYPTION_KEY_FILE} 读取加密密钥")
+        _ensure_private_file(key_path)
         with open(key_path, 'rb') as f:
             return f.read()
 
@@ -127,9 +148,10 @@ def get_encryption_key():
 
     # 生成新的密钥
     key = Fernet.generate_key()
-    os.makedirs(key_path.parent, exist_ok=True)
+    _ensure_private_dir(key_path.parent)
     with open(key_path, 'wb') as f:
         f.write(key)
+    _ensure_private_file(key_path)
     logger.info(f"已生成新的加密密钥并保存到 {ENCRYPTION_KEY_FILE}")
     logger.warning("请立即备份此密钥文件，并建议设置 ENCRYPTION_KEY_RAW 环境变量！")
     return key
@@ -137,14 +159,17 @@ def get_encryption_key():
 
 # 全局Fernet实例
 _fernet = None
+_fernet_lock = threading.Lock()
 
 
 def _get_fernet():
     """获取Fernet加密器（懒加载）"""
     global _fernet
     if _fernet is None:
-        key = get_encryption_key()
-        _fernet = Fernet(key)
+        with _fernet_lock:
+            if _fernet is None:
+                key = get_encryption_key()
+                _fernet = Fernet(key)
     return _fernet
 
 
@@ -187,8 +212,8 @@ def decrypt_password(encrypted_password: str) -> str:
         # 解密失败，可能是旧的明文密码或密钥不匹配
         if is_encrypted(encrypted_password):
             logger.error(f"密码解密失败（密钥可能不匹配）: {e}")
-        else:
-            logger.warning(f"密码解密失败，可能是未加密的旧数据: {e}")
+            return ''
+        logger.warning(f"密码解密失败，可能是未加密的旧数据: {e}")
         return encrypted_password
 
 
diff --git a/data/cookies/7bc1fcbb0be4d43e1351618100f9025a.cookies.txt b/data/cookies/7bc1fcbb0be4d43e1351618100f9025a.cookies.txt
deleted file mode 100644
index 6b9fb99..0000000
--- a/data/cookies/7bc1fcbb0be4d43e1351618100f9025a.cookies.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Netscape HTTP Cookie File
-# This file was generated by zsglpt
-postoa.aidunsoft.com	FALSE	/	FALSE	0	ASP.NET_SessionId	xtjioeuz4yvk4bx3xqyt0pyp
-postoa.aidunsoft.com	FALSE	/	FALSE	1800092244	UserInfo	userName=13974663700&Pwd=9B8DC766B11550651353D98805B4995B
diff --git a/data/encryption_key.bin b/data/encryption_key.bin
deleted file mode 100644
index d36e5d0..0000000
--- a/data/encryption_key.bin
+++ /dev/null
@@ -1 +0,0 @@
-_S5Vpk71XaK9bm5U8jHJe-x2ASm38YWNweVlmCcIauM=
\ No newline at end of file
diff --git a/data/kdocs_login_state.json b/data/kdocs_login_state.json
deleted file mode 100644
index 5940458..0000000
--- a/data/kdocs_login_state.json
+++ /dev/null
@@ -1 +0,0 @@
-{"cookies": [{"name": "rtk", "value": "TKR-frr0SNeUB_QS8ImAqRZ88rIIK7IRTro0KK-HdtleKRYhArDIuI83_yIHbCa9_86BO9I937SA6ND1STCF__uQMAf11S186mcUrxyGSrkwR86kYz1wNf1FJQr0S7Sfc_4DhCvwVq33inxQAjzYnbzBwcZ7ehHp9kmpFACUUXbKCvLj5KuIKcIKWrIIKQ.4zFZDSBph3AeBLv864R_8wNMjn1JKxrvYyHWUP2k48a-JGAp04uWZQwInOdJnQfZi4SLjyo90P0rCRjHPQYvVr", "domain": ".wps.cn", "path": "/passport/secure", "expires": 1800091730.627293, "httpOnly": true, "secure": true, "sameSite": "Lax"}, {"name": "rtk_p", "value": "TrDIKMfbcN8k007J7q9L0pITTKI_fKoAKQKSpCidtwf8A-IuTKS-IQPahV7n_VfEh5il46KgeN7beP2fWyL3k38O-_HogsMMbyrf.AN7sKhoA2uGQDU98uneV-YKt5ScQgz4bux_-CYk2jbJ3ExJ-YXiw2yjJCGuH6ccO2P3cYRL1mWt4C6UnXgeBNK", "domain": ".account.wps.cn", "path": "/passport/secure", "expires": 1800091730.627309, "httpOnly": true, "secure": true, "sameSite": "Lax"}, {"name": "rtk", "value": "TKr-frr0SNeUB_QS8ImAqRZ88rIIK7IRTro0KK-HdtleKRYhArDIuI83_yIHbCa9_86BO9I937SA6ND1STCF__uQMAf11S186mcUrxyGSrkwR86kYz1wNfbKDieEpwpIKcoTTKS.7Cma6ScQx6aLnOByuIE1uX54EB1MvADa4KVQ-sRCdxnYvxY5XG182E8fl3JRFxpwBBX0QsNsGWgSfalV0JLVNr", "domain": ".kdocs.cn", "path": "/passport/secure", "expires": 1800091731.075305, "httpOnly": true, "secure": true, "sameSite": "Lax"}, {"name": "reuse_session_id", "value": "edit/290978562164", "domain": ".www.kdocs.cn", "path": "/l/cpwEOo5ynKX4", "expires": -1, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "xsr-fe-version", "value": "20260107165518-6fa9ffc102", "domain": ".www.kdocs.cn", "path": "/l/cpwEOo5ynKX4", "expires": 1769160534, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "docset_svg_info", "value": "%7B%22active_sheet%22%3A%22%E9%81%93%E5%8E%BF%22%2C%22topleft_cell%22%3A%7B%22col%22%3A0%2C%22row%22%3A0%7D%2C%22pane_info%22%3A%7B%22activePane%22%3A1%2C%22cellLeftTop%22%3A%7B%22row%22%3A2%2C%22col%22%3A0%7D%2C%22wndPos%22%3A%7B%22left%22%3A0%2C%22top%22%3A2%7D%7D%2C%22dpi%22%3A1%2C%22w%22%3A1280%2C%22h%22%3A720%2C%22device_type%22%3A%22pc%22%2C%22active_sheet_id%22%3A2%2C%22active_sheet_type%22%3A%22xlWorksheet%22%2C%22sheet_icon_status%22%3A%7B%22sheetBgColor%22%3Atrue%2C%22showCommentIcon%22%3Atrue%2C%22showSharedSheetIcon%22%3Atrue%2C%22showProtectIcon%22%3Atrue%2C%22showMergeIcon%22%3Atrue%2C%22firstSetNotShowCommentIcon%22%3Atrue%7D%7D", "domain": ".www.kdocs.cn", "path": "/l/cpwEOo5ynKX4", "expires": 1769160533, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "xsr-cache-revision", "value": "89975", "domain": ".www.kdocs.cn", "path": "/l/cpwEOo5ynKX4", "expires": 1769160973, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "xsr-cache-fileVersion", "value": "24382", "domain": ".www.kdocs.cn", "path": "/l/cpwEOo5ynKX4", "expires": 1769160973, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "itk", "value": "TKI-frr0SNeUB_QS8ImAqRZ88rIIK7IRTro0KK-HdtleKRYhArDIuI83_yIHbCa9_86BO9I937SA6ND1STCF__uQMAf11S186mcUrxyGSrkwR86kYz1wNf1FJQr0S7Sfc_4DhCvwVq33inxQAjzYnbzBwcZ7ehHp9kmpFACUUXbKCvLj5KuIKcIKWrIIKQ.jzgjDlO8-oUi_p9xUHhY1ioMQ61aiJYgFnfh1YrtkJlDLcWOnusRs-mvxR0SNWNgdgjNL4RfBTv7t5P84LzG7w", "domain": ".account.wps.cn", "path": "/passport", "expires": 1800091730.627249, "httpOnly": true, "secure": true, "sameSite": "Lax"}, {"name": "swi_acc_redirect_limit", "value": "0", "domain": ".kdocs.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "weboffice_device_id", "value": "310c10b7b3e04a446c1f4d0bad52feac", "domain": "www.kdocs.cn", "path": "/", "expires": 1800091732.229481, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "visitorid", "value": "1178431222", "domain": "www.kdocs.cn", "path": "/", "expires": -1, "httpOnly": true, "secure": true, "sameSite": "Lax"}, {"name": "weboffice_cdn", "value": "21", "domain": "www.kdocs.cn", "path": "/", "expires": 1771147731.209312, "httpOnly": false, "secure": true, "sameSite": "Lax"}, {"name": "region", "value": "hwy", "domain": "www.kdocs.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "csrf", "value": "QGpKBAxDPkkzHrCi3M75YmZKX4rQysGQ", "domain": ".kdocs.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "wps_endcloud", "value": "1", "domain": ".kdocs.cn", "path": "/", "expires": 1771147735, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "ks_local_token", "value": "T6Fwfdr5N5YpTMWDyr6PY6PC4Dy6CBaX", "domain": ".wps.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": true, "sameSite": "None"}, {"name": "kso-wx-quick-login", "value": "459", "domain": ".kdocs.cn", "path": "/", "expires": 1800091727, "httpOnly": false, "secure": false, "sameSite": "Lax"}, {"name": "cookieCheck", "value": "1768555727430", "domain": "account.wps.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": true, "sameSite": "None"}, {"name": "wpsqing_autoLoginV1", "value": "1", "domain": ".account.wps.cn", "path": "/", "expires": 1800091727, "httpOnly": false, "secure": true, "sameSite": "None"}, {"name": "csrf", "value": "4xHAfpRRjx5YHwwmp364TWPnG6GWta8a", "domain": ".wps.cn", "path": "/", "expires": -1, "httpOnly": false, "secure": true, "sameSite": "None"}, {"name": "wpsqing_autoLoginV1", "value": "1", "domain": ".wps.cn", "path": "/", "expires": 1800091727, "httpOnly": false, "secure": true, "sameSite": "None"}, {"name": "_ku", "value": "1", "domain": ".wps.cn", "path": "/", "expires": 1800091730.627096, "httpOnly": false, "secure": true, "sameSite": "Lax"}, {"name": "cid", "value": "0", "domain": ".wps.cn", "path": "/", "expires": 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"{\"base\":\"light\",\"aid\":\"default\"}"}, {"name": "dw_store_device_id_key@baa1d7aef2927a8d", "value": "4f3a09da-895a-63c2-97d0-6a263b39abce"}]}, {"origin": "https://account.kdocs.cn", "localStorage": [{"name": "kso_acct_code_challenge@8yI_vWjD1p33STrx41heF__hjNBo5m5UH7RkNEO4GHU", "value": "3qZy-4pxQBUZzQRffoHmhXMrj4Yg2.40Q~hK0c2yZwx8KUPzk-ZZdigsoP2tCDRwj6mce3brZtg5MT1SWiSZz6aduZn0e0lPZC5S1aR6"}]}, {"origin": "https://account.wps.cn", "localStorage": [{"name": "dw_store_device_id_key@cd74cafb92f3c9a8", "value": "7b29bc7a-0fbb-89ef-a766-26d8dcfa2d0e"}, {"name": "dw_store_device_id_key", "value": "7b29bc7a-0fbb-89ef-a766-26d8dcfa2d0e"}, {"name": "dw_store_cache_events_cd74cafb92f3c9a8", "value": "[]"}, {"name": "dw_store_first_item_token_cd74cafb92f3c9a8", "value": "true"}, {"name": "dw_store_time_sub_cd74cafb92f3c9a8", "value": "54926"}, {"name": "dw_store_wait_send_events_cd74cafb92f3c9a8", "value": "[]"}, {"name": "dw_store_dynamic_data_cd74cafb92f3c9a8", "value": "{\"uploadStrategy\":{\"version\":1590138000000,\"transportControl\":{\"splitSize\":50,\"gzipSize\":10}},\"sendUrls\":{\"version\":1590138000000,\"urls\":\"(https://shuc-js.ksord.com/bat/js/cors)\",\"debugUrls\":\"(https://dw-collect-debug.ksord.com)\"},\"dnsParseIp\":\"120.92.114.92\",\"abTestTag\":{\"version\":-3},\"serverTime\":1768555782442,\"dynamicUrl\":\"https://dw-online.ksosoft.com\",\"events\":{\"version\":1767922320053,\"data\":[{\"name\":\"cloudplatform_accountwebapirealtime\",\"disable\":true},{\"name\":\"cloudplatform_accountwebjsrealtime\",\"disable\":true},{\"name\":\"cloudplatform_accountwxpluginapirealtime\",\"disable\":true},{\"name\":\"cloudplatform_accountwxpluginjs\",\"disable\":true},{\"name\":\"cloudplatform_accountwxpluginjsrealtime\",\"disable\":true},{\"name\":\"cloudplatform_login_select_click\",\"disable\":true},{\"name\":\"cloudplatform_login_select_show\",\"disable\":true},{\"name\":\"cloudplatform_wxapplets_element_authorizeclick\",\"disable\":true},{\"name\":\"cloudplatform_wxapplets_element_authorizeshow\",\"disable\":true},{\"name\":\"cloudplatform_wxapplets_element_call\",\"disable\":true},{\"name\":\"cloudplatform_wxapplets_element_loginresult\",\"disable\":true},{\"name\":\"cloudplatform_wxapplets_element_registrationresult\",\"disable\":true},{\"name\":\"enterprise_create\",\"disable\":true},{\"name\":\"login_bindphone\",\"disable\":true},{\"name\":\"login_click\",\"disable\":true},{\"name\":\"login_loadtime\",\"disable\":true},{\"name\":\"login_performance\",\"disable\":true},{\"name\":\"login_scan_quick\",\"disable\":true},{\"name\":\"login_show\",\"disable\":true},{\"name\":\"login_supportcrypto\",\"disable\":true},{\"name\":\"wechat_h5authorize_click\",\"disable\":true},{\"name\":\"wechat_h5authorize_show\",\"disable\":true}]},\"localTime\":1768555727516}"}, {"name": "dw_store_queen_data_events_cd74cafb92f3c9a8", "value": "[]"}]}]}
\ No newline at end of file
diff --git a/data/secret_key.txt b/data/secret_key.txt
deleted file mode 100644
index c31cbdb..0000000
--- a/data/secret_key.txt
+++ /dev/null
@@ -1 +0,0 @@
-4abccefe523ed05bdbb717d1153e202d25ade95458c4d78e
\ No newline at end of file
diff --git a/database.py b/database.py
index 64a3406..575e508 100644
--- a/database.py
+++ b/database.py
@@ -109,6 +109,7 @@ from db.users import (
     delete_user,
     extend_user_vip,
     get_all_users,
+    get_users_count,
     get_pending_users,
     get_user_by_id,
     get_user_by_username,
diff --git a/db/users.py b/db/users.py
index 81b343f..1a6e49c 100644
--- a/db/users.py
+++ b/db/users.py
@@ -25,6 +25,20 @@ _USER_LOOKUP_SQL = {
     "id": "SELECT * FROM users WHERE id = ?",
     "username": "SELECT * FROM users WHERE username = ?",
 }
+_USER_ADMIN_SAFE_COLUMNS = (
+    "id",
+    "username",
+    "email",
+    "email_verified",
+    "email_notify_enabled",
+    "kdocs_unit",
+    "kdocs_auto_upload",
+    "status",
+    "vip_expire_time",
+    "created_at",
+    "approved_at",
+)
+_USER_ADMIN_SAFE_COLUMNS_SQL = ", ".join(_USER_ADMIN_SAFE_COLUMNS)
 
 
 def _row_to_dict(row):
@@ -283,19 +297,63 @@ def get_user_by_username(username):
     return _get_user_by_field("username", username)
 
 
-def get_all_users():
-    """获取所有用户"""
+def _normalize_limit_offset(limit, offset, *, max_limit: int = 500):
+    normalized_limit = None
+    if limit is not None:
+        try:
+            normalized_limit = int(limit)
+        except (TypeError, ValueError):
+            normalized_limit = 50
+        normalized_limit = max(1, min(normalized_limit, max_limit))
+
+    try:
+        normalized_offset = int(offset or 0)
+    except (TypeError, ValueError):
+        normalized_offset = 0
+    normalized_offset = max(0, normalized_offset)
+
+    return normalized_limit, normalized_offset
+
+
+def get_users_count(*, status: str | None = None) -> int:
     with db_pool.get_db() as conn:
         cursor = conn.cursor()
-        cursor.execute("SELECT * FROM users ORDER BY created_at DESC")
+        if status:
+            cursor.execute("SELECT COUNT(*) AS count FROM users WHERE status = ?", (status,))
+        else:
+            cursor.execute("SELECT COUNT(*) AS count FROM users")
+        row = cursor.fetchone()
+        return int((row["count"] if row else 0) or 0)
+
+
+def get_all_users(*, limit=None, offset=0):
+    """获取所有用户"""
+    limit, offset = _normalize_limit_offset(limit, offset)
+    with db_pool.get_db() as conn:
+        cursor = conn.cursor()
+        sql = f"SELECT {_USER_ADMIN_SAFE_COLUMNS_SQL} FROM users ORDER BY created_at DESC"
+        params = []
+        if limit is not None:
+            sql += " LIMIT ? OFFSET ?"
+            params.extend([limit, offset])
+        cursor.execute(sql, params)
         return [dict(row) for row in cursor.fetchall()]
 
 
-def get_pending_users():
+def get_pending_users(*, limit=None, offset=0):
     """获取待审核用户"""
+    limit, offset = _normalize_limit_offset(limit, offset)
     with db_pool.get_db() as conn:
         cursor = conn.cursor()
-        cursor.execute("SELECT * FROM users WHERE status = 'pending' ORDER BY created_at DESC")
+        sql = (
+            f"SELECT {_USER_ADMIN_SAFE_COLUMNS_SQL} "
+            "FROM users WHERE status = 'pending' ORDER BY created_at DESC"
+        )
+        params = []
+        if limit is not None:
+            sql += " LIMIT ? OFFSET ?"
+            params.extend([limit, offset])
+        cursor.execute(sql, params)
         return [dict(row) for row in cursor.fetchall()]
 
 
diff --git a/requirements.txt b/requirements.txt
index 76e5960..8c926dd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ schedule==1.2.0
 psutil==5.9.6
 pytz==2024.1
 bcrypt==4.0.1
-requests==2.31.0
+requests==2.32.3
 python-dotenv==1.0.0
 beautifulsoup4==4.12.2
 cryptography>=41.0.0
diff --git a/routes/admin_api/core.py b/routes/admin_api/core.py
index 292bde0..8f3f232 100644
--- a/routes/admin_api/core.py
+++ b/routes/admin_api/core.py
@@ -355,9 +355,6 @@ def admin_logout():
     session.pop("admin_id", None)
     session.pop("admin_username", None)
     session.pop("admin_reauth_until", None)
-    session.pop("_user_id", None)
-    session.pop("_fresh", None)
-    session.pop("_id", None)
     return jsonify({"success": True})
 
 
diff --git a/routes/admin_api/email_api.py b/routes/admin_api/email_api.py
index d4aaa5f..94786c7 100644
--- a/routes/admin_api/email_api.py
+++ b/routes/admin_api/email_api.py
@@ -21,7 +21,7 @@ def get_email_settings_api():
         return jsonify(settings)
     except Exception as e:
         logger.error(f"获取邮件设置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "获取邮件设置失败"}), 500
 
 
 @admin_api_bp.route("/email/settings", methods=["POST"])
@@ -48,7 +48,7 @@ def update_email_settings_api():
         return jsonify({"success": True})
     except Exception as e:
         logger.error(f"更新邮件设置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "更新邮件设置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs", methods=["GET"])
@@ -60,7 +60,7 @@ def get_smtp_configs_api():
         return jsonify(configs)
     except Exception as e:
         logger.error(f"获取SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "获取SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs", methods=["POST"])
@@ -78,7 +78,7 @@ def create_smtp_config_api():
         return jsonify({"success": True, "id": config_id})
     except Exception as e:
         logger.error(f"创建SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "创建SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/<int:config_id>", methods=["GET"])
@@ -92,7 +92,7 @@ def get_smtp_config_api(config_id):
         return jsonify(config_data)
     except Exception as e:
         logger.error(f"获取SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "获取SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/<int:config_id>", methods=["PUT"])
@@ -106,7 +106,7 @@ def update_smtp_config_api(config_id):
         return jsonify({"error": "更新失败"}), 400
     except Exception as e:
         logger.error(f"更新SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "更新SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/<int:config_id>", methods=["DELETE"])
@@ -119,7 +119,7 @@ def delete_smtp_config_api(config_id):
         return jsonify({"error": "删除失败"}), 400
     except Exception as e:
         logger.error(f"删除SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "删除SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/<int:config_id>/test", methods=["POST"])
@@ -140,7 +140,7 @@ def test_smtp_config_api(config_id):
         return jsonify(result)
     except Exception as e:
         logger.error(f"测试SMTP配置失败: {e}")
-        return jsonify({"success": False, "error": str(e)}), 500
+        return jsonify({"success": False, "error": "测试SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/<int:config_id>/primary", methods=["POST"])
@@ -153,7 +153,7 @@ def set_primary_smtp_config_api(config_id):
         return jsonify({"error": "设置失败"}), 400
     except Exception as e:
         logger.error(f"设置主SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "设置主SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/smtp/configs/primary/clear", methods=["POST"])
@@ -165,7 +165,7 @@ def clear_primary_smtp_config_api():
         return jsonify({"success": True})
     except Exception as e:
         logger.error(f"取消主SMTP配置失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "取消主SMTP配置失败"}), 500
 
 
 @admin_api_bp.route("/email/stats", methods=["GET"])
@@ -177,7 +177,7 @@ def get_email_stats_api():
         return jsonify(stats)
     except Exception as e:
         logger.error(f"获取邮件统计失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "获取邮件统计失败"}), 500
 
 
 @admin_api_bp.route("/email/logs", methods=["GET"])
@@ -195,7 +195,7 @@ def get_email_logs_api():
         return jsonify(result)
     except Exception as e:
         logger.error(f"获取邮件日志失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "获取邮件日志失败"}), 500
 
 
 @admin_api_bp.route("/email/logs/cleanup", methods=["POST"])
@@ -211,4 +211,4 @@ def cleanup_email_logs_api():
         return jsonify({"success": True, "deleted": deleted})
     except Exception as e:
         logger.error(f"清理邮件日志失败: {e}")
-        return jsonify({"error": str(e)}), 500
+        return jsonify({"error": "清理邮件日志失败"}), 500
diff --git a/routes/admin_api/system_config_api.py b/routes/admin_api/system_config_api.py
index 7daa56e..aaa4663 100644
--- a/routes/admin_api/system_config_api.py
+++ b/routes/admin_api/system_config_api.py
@@ -80,7 +80,7 @@ def update_system_config_api():
     if schedule_time is not None:
         import re
 
-        if not re.match(r"^([01]\\d|2[0-3]):([0-5]\\d)$", schedule_time):
+        if not re.match(r"^([01]\d|2[0-3]):([0-5]\d)$", schedule_time):
             return jsonify({"error": "时间格式错误，应为 HH:MM"}), 400
 
     if schedule_browse_type is not None:
diff --git a/routes/admin_api/users_api.py b/routes/admin_api/users_api.py
index 8357d43..5af3484 100644
--- a/routes/admin_api/users_api.py
+++ b/routes/admin_api/users_api.py
@@ -13,20 +13,52 @@ from services.state import safe_clear_user_logs, safe_remove_user_accounts
 # ==================== 用户管理/统计（管理员） ====================
 
 
+def _parse_optional_pagination(default_limit: int = 50, max_limit: int = 500) -> tuple[int | None, int]:
+    limit_raw = request.args.get("limit")
+    offset_raw = request.args.get("offset")
+    if (limit_raw is None) and (offset_raw is None):
+        return None, 0
+
+    try:
+        limit = int(limit_raw if limit_raw is not None else default_limit)
+    except (TypeError, ValueError):
+        limit = default_limit
+    limit = max(1, min(limit, max_limit))
+
+    try:
+        offset = int(offset_raw if offset_raw is not None else 0)
+    except (TypeError, ValueError):
+        offset = 0
+    offset = max(0, offset)
+    return limit, offset
+
+
 @admin_api_bp.route("/users", methods=["GET"])
 @admin_required
 def get_all_users():
     """获取所有用户"""
-    users = database.get_all_users()
-    return jsonify(users)
+    limit, offset = _parse_optional_pagination()
+    if limit is None:
+        users = database.get_all_users()
+        return jsonify(users)
+
+    users = database.get_all_users(limit=limit, offset=offset)
+    total = database.get_users_count()
+    return jsonify({"items": users, "total": total, "limit": limit, "offset": offset})
 
 
 @admin_api_bp.route("/users/pending", methods=["GET"])
 @admin_required
 def get_pending_users():
     """获取待审核用户"""
-    users = database.get_pending_users()
-    return jsonify(users)
+    limit, offset = _parse_optional_pagination(default_limit=30, max_limit=200)
+    if limit is None:
+        users = database.get_pending_users()
+        return jsonify(users)
+
+    users = database.get_pending_users(limit=limit, offset=offset)
+    total = database.get_users_count(status="pending")
+    return jsonify({"items": users, "total": total, "limit": limit, "offset": offset})
 
 
 @admin_api_bp.route("/users/<int:user_id>/approve", methods=["POST"])
diff --git a/routes/api_accounts.py b/routes/api_accounts.py
index 0c733d9..3040b3d 100644
--- a/routes/api_accounts.py
+++ b/routes/api_accounts.py
@@ -164,11 +164,13 @@ def update_account(account_id):
             """
             UPDATE accounts
             SET password = ?, remember = ?
-            WHERE id = ?
+            WHERE id = ? AND user_id = ?
             """,
-            (encrypted_password, new_remember, account_id),
+            (encrypted_password, new_remember, account_id, user_id),
         )
         conn.commit()
+        if cursor.rowcount <= 0:
+            return jsonify({"error": "账号不存在或无权限"}), 404
 
     database.reset_account_login_status(account_id)
     logger.info(f"[账号更新] 用户 {user_id} 修改了账号 {account.username} 的密码，已重置登录状态")
diff --git a/routes/api_schedules.py b/routes/api_schedules.py
index b240928..659abb6 100644
--- a/routes/api_schedules.py
+++ b/routes/api_schedules.py
@@ -9,6 +9,7 @@ import time as time_mod
 import uuid
 
 import database
+from app_logger import get_logger
 from flask import Blueprint, jsonify, request
 from flask_login import current_user, login_required
 from services.accounts_service import load_user_accounts
@@ -17,6 +18,7 @@ from services.state import safe_get_account, safe_get_user_accounts_snapshot
 from services.tasks import submit_account_task
 
 api_schedules_bp = Blueprint("api_schedules", __name__)
+logger = get_logger("app")
 
 _HHMM_RE = re.compile(r"^(\d{1,2}):(\d{2})$")
 
@@ -391,4 +393,5 @@ def delete_schedule_logs_api(schedule_id):
         deleted = database.delete_schedule_logs(schedule_id, current_user.id)
         return jsonify({"success": True, "deleted": deleted})
     except Exception as e:
-        return jsonify({"error": str(e)}), 500
+        logger.warning(f"[schedules] 清空定时任务日志失败(schedule_id={schedule_id}): {e}")
+        return jsonify({"error": "清空日志失败，请稍后重试"}), 500
diff --git a/routes/api_screenshots.py b/routes/api_screenshots.py
index 77531eb..7fa4978 100644
--- a/routes/api_screenshots.py
+++ b/routes/api_screenshots.py
@@ -8,6 +8,7 @@ from typing import Iterator
 
 import database
 from app_config import get_config
+from app_logger import get_logger
 from app_security import is_safe_path
 from flask import Blueprint, jsonify, request, send_from_directory
 from flask_login import current_user, login_required
@@ -28,33 +29,89 @@ except AttributeError:  # Pillow<9 fallback
     _RESAMPLE_FILTER = Image.LANCZOS
 
 api_screenshots_bp = Blueprint("api_screenshots", __name__)
+logger = get_logger("app")
 
 
 def _get_user_prefix(user_id: int) -> str:
+    return f"u{int(user_id)}"
+
+
+def _get_username(user_id: int) -> str:
     user_info = database.get_user_by_id(user_id)
-    return user_info["username"] if user_info else f"user{user_id}"
+    return str(user_info.get("username") or "") if user_info else ""
 
 
-def _is_user_screenshot(filename: str, username_prefix: str) -> bool:
-    return filename.startswith(username_prefix + "_") and filename.lower().endswith(_IMAGE_EXTENSIONS)
+def _list_all_usernames() -> list[str]:
+    users = database.get_all_users()
+    result = []
+    for row in users:
+        username = str(row.get("username") or "").strip()
+        if username:
+            result.append(username)
+    return result
 
 
-def _iter_user_screenshot_entries(username_prefix: str) -> Iterator[os.DirEntry]:
+def _resolve_user_owned_prefix(
+    filename: str,
+    *,
+    user_id: int,
+    username: str,
+    all_usernames: list[str] | None = None,
+) -> str | None:
+    lower_name = filename.lower()
+    if not lower_name.endswith(_IMAGE_EXTENSIONS):
+        return None
+
+    # 新版命名：u{user_id}_...
+    id_prefix = _get_user_prefix(user_id)
+    if filename.startswith(id_prefix + "_"):
+        return id_prefix
+
+    # 兼容旧版命名：{username}_...
+    username = str(username or "").strip()
+    if not username:
+        return None
+
+    if all_usernames is None:
+        all_usernames = _list_all_usernames()
+
+    matched_usernames = [item for item in all_usernames if filename.startswith(item + "_")]
+    if not matched_usernames:
+        return None
+
+    # 取“最长匹配用户名”，避免 foo 越权读取 foo_bar 的截图。
+    max_len = max(len(item) for item in matched_usernames)
+    winners = [item for item in matched_usernames if len(item) == max_len]
+    if len(winners) != 1:
+        return None
+    if winners[0] != username:
+        return None
+    return winners[0]
+
+
+def _iter_user_screenshot_entries(user_id: int, username: str, all_usernames: list[str]) -> Iterator[tuple[os.DirEntry, str]]:
     if not os.path.exists(SCREENSHOTS_DIR):
         return
 
     with os.scandir(SCREENSHOTS_DIR) as entries:
         for entry in entries:
-            if (not entry.is_file()) or (not _is_user_screenshot(entry.name, username_prefix)):
+            if not entry.is_file():
                 continue
-            yield entry
+            matched_prefix = _resolve_user_owned_prefix(
+                entry.name,
+                user_id=user_id,
+                username=username,
+                all_usernames=all_usernames,
+            )
+            if not matched_prefix:
+                continue
+            yield entry, matched_prefix
 
 
-def _build_display_name(filename: str) -> str:
-    base_name, ext = filename.rsplit(".", 1)
-    parts = base_name.split("_", 1)
-    if len(parts) > 1:
-        return f"{parts[1]}.{ext}"
+def _build_display_name(filename: str, owner_prefix: str) -> str:
+    prefix = f"{owner_prefix}_"
+    if filename.startswith(prefix):
+        return filename[len(prefix) :]
     return filename
 
 
@@ -126,11 +183,12 @@ def _parse_optional_pagination(default_limit: int = 24, *, max_limit: int = 100)
 def get_screenshots():
     """获取当前用户的截图列表"""
     user_id = current_user.id
-    username_prefix = _get_user_prefix(user_id)
+    username = _get_username(user_id)
 
     try:
         screenshots = []
-        for entry in _iter_user_screenshot_entries(username_prefix):
+        all_usernames = _list_all_usernames()
+        for entry, matched_prefix in _iter_user_screenshot_entries(user_id, username, all_usernames):
             filename = entry.name
             stat = entry.stat()
             created_time = datetime.fromtimestamp(stat.st_mtime, tz=BEIJING_TZ)
@@ -138,7 +196,7 @@ def get_screenshots():
             screenshots.append(
                 {
                     "filename": filename,
-                    "display_name": _build_display_name(filename),
+                    "display_name": _build_display_name(filename, matched_prefix),
                     "size": stat.st_size,
                     "created": created_time.strftime("%Y-%m-%d %H:%M:%S"),
                     "_created_ts": stat.st_mtime,
@@ -157,7 +215,8 @@ def get_screenshots():
 
         return jsonify(screenshots)
     except Exception as e:
-        return jsonify({"error": str(e)}), 500
+        logger.warning(f"[screenshots] 获取截图列表失败(user_id={user_id}): {e}")
+        return jsonify({"error": "获取截图列表失败"}), 500
 
 
 @api_screenshots_bp.route("/screenshots/<filename>")
@@ -165,9 +224,8 @@ def get_screenshots():
 def serve_screenshot(filename):
     """提供原图文件访问"""
     user_id = current_user.id
-    username_prefix = _get_user_prefix(user_id)
-
-    if not _is_user_screenshot(filename, username_prefix):
+    username = _get_username(user_id)
+    if not _resolve_user_owned_prefix(filename, user_id=user_id, username=username):
         return jsonify({"error": "无权访问"}), 403
 
     if not is_safe_path(SCREENSHOTS_DIR, filename):
@@ -181,9 +239,8 @@ def serve_screenshot(filename):
 def serve_screenshot_thumbnail(filename):
     """提供缩略图访问（失败时自动回退原图）"""
     user_id = current_user.id
-    username_prefix = _get_user_prefix(user_id)
-
-    if not _is_user_screenshot(filename, username_prefix):
+    username = _get_username(user_id)
+    if not _resolve_user_owned_prefix(filename, user_id=user_id, username=username):
         return jsonify({"error": "无权访问"}), 403
 
     if not is_safe_path(SCREENSHOTS_DIR, filename):
@@ -209,9 +266,8 @@ def serve_screenshot_thumbnail(filename):
 def delete_screenshot(filename):
     """删除指定截图"""
     user_id = current_user.id
-    username_prefix = _get_user_prefix(user_id)
-
-    if not _is_user_screenshot(filename, username_prefix):
+    username = _get_username(user_id)
+    if not _resolve_user_owned_prefix(filename, user_id=user_id, username=username):
         return jsonify({"error": "无权删除"}), 403
 
     if not is_safe_path(SCREENSHOTS_DIR, filename):
@@ -226,7 +282,8 @@ def delete_screenshot(filename):
             return jsonify({"success": True})
         return jsonify({"error": "文件不存在"}), 404
     except Exception as e:
-        return jsonify({"error": str(e)}), 500
+        logger.warning(f"[screenshots] 删除截图失败(user_id={user_id}, filename={filename}): {e}")
+        return jsonify({"error": "删除截图失败"}), 500
 
 
 @api_screenshots_bp.route("/api/screenshots/clear", methods=["POST"])
@@ -234,11 +291,12 @@ def delete_screenshot(filename):
 def clear_all_screenshots():
     """清空当前用户的所有截图"""
     user_id = current_user.id
-    username_prefix = _get_user_prefix(user_id)
+    username = _get_username(user_id)
 
     try:
         deleted_count = 0
-        for entry in _iter_user_screenshot_entries(username_prefix):
+        all_usernames = _list_all_usernames()
+        for entry, _ in _iter_user_screenshot_entries(user_id, username, all_usernames):
             os.remove(entry.path)
             _remove_thumbnail(entry.name)
             deleted_count += 1
@@ -246,4 +304,5 @@ def clear_all_screenshots():
         log_to_client(f"清理了 {deleted_count} 个截图文件", user_id)
         return jsonify({"success": True, "deleted": deleted_count})
     except Exception as e:
-        return jsonify({"error": str(e)}), 500
+        logger.warning(f"[screenshots] 清空截图失败(user_id={user_id}): {e}")
+        return jsonify({"error": "清空截图失败"}), 500
diff --git a/services/kdocs_uploader.py b/services/kdocs_uploader.py
index 4d25fc5..17c0f39 100644
--- a/services/kdocs_uploader.py
+++ b/services/kdocs_uploader.py
@@ -325,6 +325,10 @@ class KDocsUploader:
             if self._context is None:
                 storage_state = getattr(config, "KDOCS_LOGIN_STATE_FILE", "data/kdocs_login_state.json")
                 if use_storage_state and os.path.exists(storage_state):
+                    try:
+                        os.chmod(storage_state, 0o600)
+                    except Exception:
+                        pass
                     self._context = self._browser.new_context(storage_state=storage_state)
                 else:
                     self._context = self._browser.new_context()
@@ -837,8 +841,18 @@ class KDocsUploader:
     def _save_login_state(self) -> None:
         try:
             storage_state = getattr(config, "KDOCS_LOGIN_STATE_FILE", "data/kdocs_login_state.json")
-            os.makedirs(os.path.dirname(storage_state), exist_ok=True)
+            state_dir = os.path.dirname(storage_state)
+            if state_dir:
+                os.makedirs(state_dir, mode=0o700, exist_ok=True)
+                try:
+                    os.chmod(state_dir, 0o700)
+                except Exception:
+                    pass
             self._context.storage_state(path=storage_state)
+            try:
+                os.chmod(storage_state, 0o600)
+            except Exception:
+                pass
         except Exception as e:
             logger.warning(f"[KDocs] 保存登录态失败: {e}")
 
diff --git a/services/screenshots.py b/services/screenshots.py
index f0b2fbf..0c2717a 100644
--- a/services/screenshots.py
+++ b/services/screenshots.py
@@ -538,9 +538,8 @@ def take_screenshot_for_account(
     # 标记账号正在截图（防止重复提交截图任务）
     account.is_running = True
 
-
     user_info = database.get_user_by_id(user_id)
-    username_prefix = user_info["username"] if user_info else f"user{user_id}"
+    username_prefix = f"u{int(user_id)}"
 
     def screenshot_task(
         browser_instance, user_id, account_id, account, browse_type, source, task_start_time, browse_result
diff --git a/tests/test_security_hardening.py b/tests/test_security_hardening.py
index bf32e09..21bfe05 100644
--- a/tests/test_security_hardening.py
+++ b/tests/test_security_hardening.py
@@ -3,7 +3,7 @@ import sys
 from pathlib import Path
 
 import pytest
-from flask import Flask
+from flask import Flask, session
 
 PROJECT_ROOT = Path(__file__).resolve().parents[1]
 if str(PROJECT_ROOT) not in sys.path:
@@ -56,3 +56,24 @@ def test_get_encryption_key_refuses_regeneration_when_encrypted_data_exists(monk
 
     with pytest.raises(RuntimeError):
         crypto_utils.get_encryption_key()
+
+
+def test_validate_csrf_token_requires_matching_session_token():
+    app = Flask(__name__)
+    app.secret_key = "test-secret-key"
+
+    with app.test_request_context("/", method="POST"):
+        session["csrf_token"] = "fixed-token"
+        assert app_security.validate_csrf_token("fixed-token") is True
+        assert app_security.validate_csrf_token("wrong-token") is False
+        assert app_security.validate_csrf_token("") is False
+
+
+def test_decrypt_password_returns_empty_for_unreadable_encrypted_payload(monkeypatch):
+    class BrokenFernet:
+        def decrypt(self, *_args, **_kwargs):
+            raise ValueError("bad token")
+
+    monkeypatch.setattr(crypto_utils, "_get_fernet", lambda: BrokenFernet())
+    encrypted_like_value = "gAAAAABrokenPayload"
+    assert crypto_utils.decrypt_password(encrypted_like_value) == ""