CVE-2026-20896
Gitea Docker image trusts spoofable reverse-proxy headers by default
Vexday Risk Score
70High priority
SSVC decision (CISA)
Act
Exploitation + impact → act immediately
Exploit maturity
Proof of concept
Popular PoC on GitHub (9 stars) — exploitation code widely available.
CVSS 9.8EPSS 0.8%KEV nãoPoC públicaNuclei —Metasploit —Patch referenciado
Lifecycle
02 Jul 2026Public PoC
03 Jul 2026Published on NVD
Recommendation: Patch as soon as possible — active exploitation confirmed.
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Gitea · Gitea Open Source Git Serverpublic PoCs found — 5
githubgithub.com/szybnev/cve-2026-20896-gitea-poc★ 9githubgithub.com/rz1027/CVE-2026-20896★ 6githubgithub.com/kaleth4/CVE-2026-20896★ 1vulncheckvulncheck.com/xdb/0ede3f054e22unverifiedvulncheckvulncheck.com/xdb/dac65188755eunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.