diff --git a/README.md b/README.md
index b2ed81ec..e267fbcd 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,11 @@
 >
 > 目标：让 `claude`（Claude Code CLI）与 Antigravity / Gemini 账户体系无缝对接，并提供可观测、可运维的稳定转发服务。
 
+> [!CAUTION]
+> **安全更新通知**：v1.1.248 及以下版本存在严重的管理员认证绕过漏洞，攻击者可未授权访问管理面板。
+>
+> **请立即更新到 v1.1.249+ 版本**，或迁移到新一代项目 **[CRS 2.0 (sub2api)](https://github.com/Wei-Shaw/sub2api)**
+
 <div align="center">
 
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
diff --git a/README_EN.md b/README_EN.md
index 856ecb90..e3e8cdbb 100644
--- a/README_EN.md
+++ b/README_EN.md
@@ -1,6 +1,12 @@
 # Claude Relay Service (Antigravity Edition)
 
-Maintained fork by **dadongwo**.
+
+> [!CAUTION]
+> **Security Update**: v1.1.248 and below contain a critical admin authentication bypass vulnerability allowing unauthorized access to the admin panel.
+>
+> **Please update to v1.1.249+ immediately**, or migrate to the next-generation project **[CRS 2.0 (sub2api)](https://github.com/Wei-Shaw/sub2api)**
+
+<div align="center">
 
 This fork focuses on:
 - Native compatibility for `claude` (Claude Code CLI)
diff --git a/SECURITY.md b/SECURITY.md
new file mode 100644
index 00000000..034e8480
--- /dev/null
+++ b/SECURITY.md
@@ -0,0 +1,21 @@
+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 5.1.x   | :white_check_mark: |
+| 5.0.x   | :x:                |
+| 4.0.x   | :white_check_mark: |
+| < 4.0   | :x:                |
+
+## Reporting a Vulnerability
+
+Use this section to tell people how to report a vulnerability.
+
+Tell them where to go, how often they can expect to get an update on a
+reported vulnerability, what to expect if the vulnerability is accepted or
+declined, etc.
diff --git a/VERSION b/VERSION
index 9c6cacb8..0f5fe772 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.1.241
+1.1.252
diff --git a/src/middleware/auth.js b/src/middleware/auth.js
index 8cccee0c..1883a2a0 100644
--- a/src/middleware/auth.js
+++ b/src/middleware/auth.js
@@ -1434,7 +1434,6 @@ const authenticateAdmin = async (req, res, next) => {
 
     // 设置管理员信息（只包含必要信息）
     req.admin = {
-      id: adminSession.adminId || 'admin',
       username: adminSession.username,
       sessionId: token,
       loginTime: adminSession.loginTime
@@ -1567,17 +1566,25 @@ const authenticateUserOrAdmin = async (req, res, next) => {
       try {
         const adminSession = await redis.getSession(adminToken)
         if (adminSession && Object.keys(adminSession).length > 0) {
-          req.admin = {
-            id: adminSession.adminId || 'admin',
-            username: adminSession.username,
-            sessionId: adminToken,
-            loginTime: adminSession.loginTime
-          }
-          req.userType = 'admin'
+          // 🔒 安全修复：验证会话必须字段（与 authenticateAdmin 保持一致）
+          if (!adminSession.username || !adminSession.loginTime) {
+            logger.security(
+              `🔒 Corrupted admin session in authenticateUserOrAdmin from ${req.ip || 'unknown'} - missing required fields (username: ${!!adminSession.username}, loginTime: ${!!adminSession.loginTime})`
+            )
+            await redis.deleteSession(adminToken) // 清理无效/伪造的会话
+            // 不返回 401，继续尝试用户认证
+          } else {
+            req.admin = {
+              username: adminSession.username,
+              sessionId: adminToken,
+              loginTime: adminSession.loginTime
+            }
+            req.userType = 'admin'
 
-          const authDuration = Date.now() - startTime
-          logger.security(`🔐 Admin authenticated: ${adminSession.username} in ${authDuration}ms`)
-          return next()
+            const authDuration = Date.now() - startTime
+            logger.security(`🔐 Admin authenticated: ${adminSession.username} in ${authDuration}ms`)
+            return next()
+          }
         }
       } catch (error) {
         logger.debug('Admin authentication failed, trying user authentication:', error.message)
diff --git a/src/routes/api.js b/src/routes/api.js
index 6ec81cbd..4b983d64 100644
--- a/src/routes/api.js
+++ b/src/routes/api.js
@@ -205,18 +205,18 @@ async function handleMessagesRequest(req, res) {
     const isStream = req.body.stream === true
 
     // 临时修复新版本客户端，删除context_management字段，避免报错
-    // if (req.body.context_management) {
-    //   delete req.body.context_management
-    // }
+    if (req.body.context_management) {
+      delete req.body.context_management
+    }
 
     // 遍历tools数组，删除input_examples字段
-    // if (req.body.tools && Array.isArray(req.body.tools)) {
-    //   req.body.tools.forEach((tool) => {
-    //     if (tool && typeof tool === 'object' && tool.input_examples) {
-    //       delete tool.input_examples
-    //     }
-    //   })
-    // }
+    if (req.body.tools && Array.isArray(req.body.tools)) {
+      req.body.tools.forEach((tool) => {
+        if (tool && typeof tool === 'object' && tool.input_examples) {
+          delete tool.input_examples
+        }
+      })
+    }
 
     logger.api(
       `🚀 Processing ${isStream ? 'stream' : 'non-stream'} request for key: ${req.apiKey.name}`
diff --git a/src/routes/openaiClaudeRoutes.js b/src/routes/openaiClaudeRoutes.js
index 2bb7cc09..35314e4a 100644
--- a/src/routes/openaiClaudeRoutes.js
+++ b/src/routes/openaiClaudeRoutes.js
@@ -402,16 +402,29 @@ async function handleChatCompletion(req, res, apiKeyData) {
     const duration = Date.now() - startTime
     logger.info(`✅ OpenAI-Claude request completed in ${duration}ms`)
   } catch (error) {
-    logger.error('❌ OpenAI-Claude request error:', error)
+    // 客户端主动断开连接是正常情况，使用 INFO 级别
+    if (error.message === 'Client disconnected') {
+      logger.info('🔌 OpenAI-Claude stream ended: Client disconnected')
+    } else {
+      logger.error('❌ OpenAI-Claude request error:', error)
+    }
 
-    const status = error.status || 500
-    res.status(status).json({
-      error: {
-        message: error.message || 'Internal server error',
-        type: 'server_error',
-        code: 'internal_error'
+    // 检查响应是否已发送（流式响应场景），避免 ERR_HTTP_HEADERS_SENT
+    if (!res.headersSent) {
+      // 客户端断开使用 499 状态码 (Client Closed Request)
+      if (error.message === 'Client disconnected') {
+        res.status(499).end()
+      } else {
+        const status = error.status || 500
+        res.status(status).json({
+          error: {
+            message: error.message || 'Internal server error',
+            type: 'server_error',
+            code: 'internal_error'
+          }
+        })
       }
-    })
+    }
   } finally {
     // 清理资源
     if (abortController) {
diff --git a/src/routes/openaiGeminiRoutes.js b/src/routes/openaiGeminiRoutes.js
index a2678e3f..9b6b5bb8 100644
--- a/src/routes/openaiGeminiRoutes.js
+++ b/src/routes/openaiGeminiRoutes.js
@@ -673,17 +673,24 @@ router.post('/v1/chat/completions', authenticateApiKey, async (req, res) => {
       }
     }
 
-    // 返回 OpenAI 格式的错误响应
-    const status = error.status || 500
-    const errorResponse = {
-      error: error.error || {
-        message: error.message || 'Internal server error',
-        type: 'server_error',
-        code: 'internal_error'
+    // 检查响应是否已发送（流式响应场景），避免 ERR_HTTP_HEADERS_SENT
+    if (!res.headersSent) {
+      // 客户端断开使用 499 状态码 (Client Closed Request)
+      if (error.message === 'Client disconnected') {
+        res.status(499).end()
+      } else {
+        // 返回 OpenAI 格式的错误响应
+        const status = error.status || 500
+        const errorResponse = {
+          error: error.error || {
+            message: error.message || 'Internal server error',
+            type: 'server_error',
+            code: 'internal_error'
+          }
+        }
+        res.status(status).json(errorResponse)
       }
     }
-
-    res.status(status).json(errorResponse)
   } finally {
     // 清理资源
     if (abortController) {