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CVE-2026-49473— Cedar authorization-for-expressjs 处理逻辑错误漏洞

一分钟漏洞结论

影响对象
cedar-policy authorization-for-expressjs
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Cedar authorization-for-expressjs是Cedar组织的一款基于策略的授权中间件。 Cedar authorization-for-expressjs 0.3.0之前版本存在安全漏洞，该漏洞源于中间件使用包含查询字符串的req.originalUrl匹配请求与Cedar操作映射，而Express仅使用路径进行路由，导致授权与执行不一致，攻击者可通过附加查询字符串绕过更严格的授权策略，可能导致越权访问。

CVSS 8.8 · High EPSS 0.47% · P40

影响版本矩阵 1

厂商产品 版本范围状态
cedar-policy authorization-for-expressjs < 0.3.0 affected
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一、 漏洞 CVE-2026-49473 基础信息

漏洞信息
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Vulnerability Title
@cedar-policy/authorization-for-expressjs has an authorization bypass via query string manipulation
来源: CVE Program / CVE List V5
Vulnerability Description
@cedar-policy/authorization-for-expressjs is an open-source Express.js middleware that integrates Cedar authorization into Express applications by mapping HTTP requests to Cedar actions and evaluating authorization policies before allowing requests to proceed. Versions prior to 0.3.0 have an issue where, under certain circumstances, the middleware matches incoming requests against Cedar action mappings using req.originalUrl, which includes the query string, while Express routes requests using only the path component. The middleware uses req.originalUrl to match incoming requests against Cedar action mappings. In Express, req.originalUrl includes the query string, while route matching uses only the path. This creates a divergence between what Cedar authorizes and what Express executes. When an application defines separate actions for overlapping path prefixes with different authorization requirements (for example, GET /users for listing all users with admin-only access, and GET /users/{id} for retrieving a single user with any authenticated user access), an actor can append a query string to bypass the more restrictive policy. Sending GET /users/?x=1 causes the middleware to match against /users/{id} (with id parameter set to ?x=1) and evaluate the less restrictive action, while Express routes the request to the /users list handler. This allows inappropriate access to the more restrictive endpoint. This issue has been addressed in version 0.30. Some workarounds are available. Validate and sanitize incoming request paths before they reach the authorization middleware. Ensure that applications do not rely solely on the middleware for authorization when defining multiple actions on overlapping path prefixes with different permission levels.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
解释冲突
来源: CVE Program / CVE List V5
Vulnerability Title
Cedar authorization-for-expressjs 处理逻辑错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Cedar authorization-for-expressjs是Cedar组织的一款基于策略的授权中间件。 Cedar authorization-for-expressjs 0.3.0之前版本存在安全漏洞，该漏洞源于中间件使用包含查询字符串的req.originalUrl匹配请求与Cedar操作映射，而Express仅使用路径进行路由，导致授权与执行不一致，攻击者可通过附加查询字符串绕过更严格的授权策略，可能导致越权访问。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD

受影响产品

厂商 产品 影响版本 CPE 订阅
cedar-policy authorization-for-expressjs < 0.3.0 -

二、漏洞 CVE-2026-49473 的公开POC

# POC 描述 源链接 神龙链接
AI 生成 POC 高级
Qwen3.6-35B-A3B · 7270 chars
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三、漏洞 CVE-2026-49473 的情报信息

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CVE-2026-49473 厂商安全公告 (1)

CVE-2026-49473 厂商页面 (1)

IV. Related Vulnerabilities

Same vendor: cedar-policy
Same weakness: CWE-436

V. Comments for CVE-2026-49473

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