CVE-2026-85751
criticalMailu is a mail server distributed as a set of Docker images.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Mailu/Mailu/commit/dffa97cbd889ab208246372ce9c86e99abb27ae9 security-advisories@github.com
- https://github.com/Mailu/Mailu/commit/ff4003d045753013470945336448dbd790cac778 security-advisories@github.com
- https://github.com/Mailu/Mailu/pull/4070 security-advisories@github.com
- https://github.com/Mailu/Mailu/pull/4071 security-advisories@github.com
- https://github.com/Mailu/Mailu/releases/tag/2024.06.55 security-advisories@github.com
- https://github.com/Mailu/Mailu/security/advisories/GHSA-rfhj-4wcq-74xg security-advisories@github.com