by Kastro
Paper/Archive/CVE-2026-20896

CVE-2026-20896

Gitea Gitea Open Source Git Server — Gitea Docker image trusts spoofable reverse-proxy headers by default

EPSS 3%public exploitCVSS 9.8
critical.is priorityof 100
57
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 86.2.862 × 2017.2Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Gitea Open Source Git Server≤ 1.26.2–CNA

Scores by source

Gitea (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4patchgithub.com/go-gitea/gitea/pull/38151refgithub.com/go-gitea/gitea/releases/tag/v1.26.3refblog.gitea.com/release-of-1.26.3-and-1.26.4