{"action":"Upgrade code.gitea.io/gitea to 1.26.3 or later.","affected":[{"fixed":"1.26.3","introduced":"0"}],"component":"code.gitea.io/gitea","cve_ids":["CVE-2026-20896"],"ecosystem":"Go","epss":0.02755,"exploited":false,"fixed_versions":["1.26.3"],"ghsa_id":"GHSA-f75j-4cw6-rmx4","id":"tcs_01M5KGRHJRQEBKRBV0QD5J2PA7","modified_at":"2026-07-22T21:00:28.336016287Z","published_at":"2026-07-22T20:36:35Z","references":["https://osv.dev/vulnerability/GO-2026-6051","https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4","https://nvd.nist.gov/vuln/detail/CVE-2026-20896","https://blog.gitea.com/release-of-1.26.3-and-1.26.4","https://github.com/go-gitea/gitea/commit/99f8b3d9a1d32f4c39828e07971455a18191e0b9","https://github.com/go-gitea/gitea/pull/38151","https://github.com/go-gitea/gitea/releases/tag/v1.26.3"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"GO-2026-6051","url":"https://osv.dev/vulnerability/GO-2026-6051"},{"source":"nvd","source_id":"CVE-2026-20896","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20896"}],"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"}