Gitea Docker image versions up to and including 1.26.2 use REVERSE_PROXY_TRUSTED_PROXIES=* by default, allowing any source IP to impersonate a user when reverse-proxy authentication headers such as X-WEBAUTH-USER are enabled.
[POC] GHSA-3whf-vgf2-9w6g — CVE-2026-20896
Gitea Docker Image Authentication Bypass
[POC] GHSA-8qqm-fp2q-v734 — CVE-2026-20896
this is a modified POC of rz1027 for CVE-2026-20896
[POC] CVE-2026-20896 — CVE-2026-20896
Public PoC and detector for CVE-2026-20896 ("Gitea Docker: One Header, Any User")
PoC: CVE-2026-20896-Gitea-Authentication-Bypass
An explanation and PoC to exploit CVE-2026-20896 Authentication Bypass Vulnerability on Gitea. Being able to steal session tokens for valid users in the Gitea instance.
PoC: cve-2026-20896-gitea-poc
CVE-2026-20896 Gitea Docker X-WEBAUTH-USER auth bypass checker
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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