{"cve":"CVE-2026-20896","nvd":{"published":"2026-07-03T21:16:56.660","modified":"2026-10-25T15:10:00.147","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-284"],"references":["https://blog.gitea.com/release-of-1.26.3-and-1.26.4/","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3","https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4","https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4"],"products":[],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-20896","score":0.02755,"percentile":0.86136,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-f75j-4cw6-rmx4","url":"https://osv.dev/vulnerability/GHSA-f75j-4cw6-rmx4","summary":"Gitea Docker image: `REVERSE_PROXY_TRUSTED_PROXIES = *` default lets any source IP impersonate any user via `X-WEBAUTH-USER`","modified":"2026-07-22T21:11:39.289604207Z","packages":[{"ecosystem":"Go","name":"code.gitea.io/gitea","purl":"pkg:golang/code.gitea.io/gitea","ranges":["<1.26.3"],"fixed":["1.26.3"]}]},{"id":"GO-2026-6051","url":"https://osv.dev/vulnerability/GO-2026-6051","summary":"Gitea Docker image: `REVERSE_PROXY_TRUSTED_PROXIES = *` default lets any source IP impersonate any user via `X-WEBAUTH-USER` in code.gitea.io/gitea","modified":"2026-07-22T21:00:28.336016287Z","packages":[{"ecosystem":"Go","name":"code.gitea.io/gitea","purl":"pkg:golang/code.gitea.io/gitea","ranges":["<1.26.3"],"fixed":["1.26.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}