CVE-2026-85751— Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust
一分钟漏洞结论
影响对象
Mailu Mailu
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。
Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for
影响版本矩阵 2
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Mailu | helm-charts | < 2.7.3 |
affected |
| Mailu | Mailu | >= 2.0.0, < 2024.06.55 |
affected |
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一、 漏洞 CVE-2026-85751 基础信息
漏洞信息
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust
来源: CVE Program / CVE List V5
Vulnerability Description
Mailu is a mail server distributed as a set of Docker images. From Mailu 2.0 until 2024.06.55 and prior to Mailu helm-charts 2.7.3, deployments with PROXY_AUTH_WHITELIST configured but REAL_IP_HEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The proxy_hide_header directive in the nginx template at core/nginx/conf/proxy.conf hid the header from upstream responses but did not overwrite the incoming request value in this configuration. An unauthenticated remote attacker could therefore spoof the trusted proxy identity and bypass authentication. This issue is fixed in Mailu 2024.06.55 and Mailu helm-charts 2.7.3.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Mailu | Mailu | >= 2.0.0, < 2024.06.55 | - |
|
| Mailu | helm-charts | < 2.7.3 | - |
|
二、漏洞 CVE-2026-85751 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-85751 补丁与修复 (4)
-
Ensure we set X-Forwarded-By · Mailu/Mailu@dffa97c · GitHub x_refsource_MISC
-
Ensure we set X-Forwarded-By · Mailu/Mailu@ff4003d · GitHub x_refsource_MISC
CVE-2026-85751 其他参考 (2)
-
Release 2024.06.55 · Mailu/Mailu · GitHub x_refsource_MISC
IV. Related Vulnerabilities
V. Comments for CVE-2026-85751
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