CVE-2026-85751

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...

CVE-2026-85751 Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...

EUVD-2026-83975

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...

CVE-2026-85751

Mailu is a mail server distributed as a set of Docker images. In deployments where PROXY_AUTH_WHITELIST was configured but REAL_IP_HEADER was unset (Mailu 2.0 through 2024.06.54; helm-charts prior to 2.7.3), nginx trusted a client-controlled X-Forwarded-By header for proxy authentication. The pro...

CVE-2026-85751 Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...

CVE-2026-85751 Mailu: Authentication bypass in header-based proxy authentication via spoofable `X-Forwarded-By` trust

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...

PT-2026-96145

Name of the Vulnerable Software and Affected Versions Mailu versions 2.0 through 2024.06.54 Mailu helm-charts versions prior to 2.7.3 Description Deployments configured with PROXY AUTH WHITELIST but without REAL IP HEADER set trust a client-controlled X-Forwarded-By header for proxy authenticatio...

CVE-2026-85751: Authentication Bypass by Spoofing

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 PROXYAUTHWHITELIST configured but REALIPHEADER unset trusted a client-controlled X-Forwarded-By header for header-based proxy authentication. The...