CVE-2026-20896

Description

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.

References

• https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-41614
• https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4
• https://github.com/go-gitea/gitea/pull/38151
• https://github.com/go-gitea/gitea/releases/tag/v1.26.3
• https://blog.gitea.com/release-of-1.26.3-and-1.26.4/
• https://packetstorm.news/files/id/227315/
• https://packetstorm.news/download/227315
• https://packetstorm.news/files/id/227542/
• https://packetstorm.news/download/227542
• https://packetstorm.news/files/id/226143/
• https://packetstorm.news/download/226143
• https://github.com/EQSTLab/CVE-2026-20896
• https://raw.githubusercontent.com/EQSTLab/CVE-2026-20896/main/poc.py