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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Public exploits 8
- EQSTLab/CVE-2026-20896 PoC on GitHub
- Raincombat/CVE-2026-20896-Gitea-CTF PoC on GitHub
- XaocZenon/CVE-2026-20896 PoC on GitHub
- judgedbykira/CVE-2026-20896-Gitea-Authentication-Bypass PoC on GitHub
- kaleth4/CVE-2026-20896 PoC on GitHub
- rz1027/CVE-2026-20896 PoC on GitHub
- szybnev/cve-2026-20896-gitea-poc PoC on GitHub
- yym8538/CVE-2026-20896 PoC on GitHub
Each line links to the index that lists it, never to exploit code. Exploit-DB's "verified" and a Metasploit rank of good or better count as verified; a PoC-in-GitHub entry is a repository's claim.
Change history 1
- First seenCVSS 9.8NVD modified 2026-10-25 15:10
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.