CVE-2026-123339— Symfony 4.4.40 远程请求伪造漏洞
一分钟漏洞结论
影响对象
sensiolabs symfony
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
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。
在 Symfony HttpKernel 的以下版本中存在对转发头部（forwarded headers）信任不当的漏洞：5.4 系列低于 5.4.56、6.x 系列低于 6.4.50、7.x 系列低于 7.4.23，以及 8.x 系列低于 8.1.11。该漏洞允许远程攻击者控制请求后续阶段中生成的绝对 URL 的主机（host）、协议（scheme）和端口（port），从而污染由共享缓存存储的页面链接，以及在该页面渲染后发送的电子邮件中的链接。 当页面渲染内联片段（例如使用 Twig 的 函数，或内联渲染的 ES
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一、 漏洞 CVE-2026-123339 基础信息
漏洞信息
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Vulnerability Title
Symfony: Inline Fragments Let Untrusted Forwarded Headers Set the Host, Scheme and Port of the URLs Generated for the Main Request
来源: CVE Program / CVE List V5
Vulnerability Description
Improper trust of forwarded headers in RouterListener::onKernelFinishRequest() in Symfony HttpKernel versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11 allows a remote attacker to control the host, scheme, and port of absolute URLs generated for the rest of the request, poisoning links in pages stored by a shared cache and in e-mails sent after the page was rendered.When a page renders an inline fragment (render() in Twig, or an ESI tag rendered inline), SubRequestHandler temporarily adds 127.0.0.1 to the trusted proxies, and RouterListener rebuilds the router context from the main request while that trust is still active, so the X-Forwarded-* and Forwarded headers of a request whose client address is 127.0.0.1 are trusted even though that address is not a configured trusted proxy. From that point on, every absolute URL the router generates for the rest of the main request takes its host, scheme, and port from headers sent by the client, including URLs produced by url() in Twig and by UrlGeneratorInterface::ABSOLUTE_URL.
Applications are affected when they are reached over HTTP from 127.0.0.1, for example behind a TLS terminator, reverse proxy, local HTTP cache, or sidecar proxy on the same host, and that proxy passes the client’s forwarded headers along. With the default configuration (framework.trusted_proxies unset), all forwarded headers, including X-Forwarded-Host, are trusted during that window. Applications served through php-fpm, mod_php, or a proxy on another host are not affected. When framework.trusted_hosts is configured, a forwarded host outside the list is rejected, but the scheme and port can still be changed.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| sensiolabs | symfony | 0 ~ 5.4.56 | - |
|
二、漏洞 CVE-2026-123339 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-123339 其他参考 (2)
-
https://github.com/symfony/symfony/security/advisories/GHSA-wg5q-m2ww-f3c9 third-party-advisory
同批安全公告 · sensiolabs · 2026-11-06 · 共 6 条
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| CVE-2026-121623 | 8.2 HIGH | Symfony DataUriNormalizer 任意文件读取漏洞 |
| CVE-2026-122053 | 6.9 MEDIUM | Symfony ObjectNormalizer 忽略属性路径遍历漏洞 |
| CVE-2026-123746 | 2.3 LOW | Symfony 认证绕过漏洞 |