{"id":"CVE-2026-20896","state":"PUBLISHED","title":"Gitea Docker image trusts spoofable reverse-proxy headers by default","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.","publishedAt":"2026-07-03T20:19:29.588Z","updatedAt":"2026-07-07T17:00:46.549Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Gitea"},"assigner":"Gitea","products":["Gitea Gitea Open Source Git Server"],"affected":[{"vendor":"Gitea","product":"Gitea Open Source Git Server","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.26.2","versionType":"semver"}]}],"references":["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/"],"weaknesses":["CWE-284"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/20xxx/CVE-2026-20896.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-20896","state":"PUBLISHED","datePublished":"2026-07-03T20:19:29.588Z","dateUpdated":"2026-07-07T17:00:46.549Z","assignerShortName":"Gitea","assignerOrgId":"88ee5874-cf24-4952-aea0-31affedb7ff2","dateReserved":"2026-03-03T03:25:59.988Z"},"containers":{"cna":{"title":"Gitea Docker image trusts spoofable reverse-proxy headers by default","descriptions":[{"lang":"en","value":"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":[{"vendor":"Gitea","product":"Gitea Open Source Git Server","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"1.26.2","versionType":"semver"}]}],"references":[{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4","name":"GitHub Security Advisory","tags":["vendor-advisory"]},{"url":"https://github.com/go-gitea/gitea/pull/38151","name":"GitHub Pull Request #38151","tags":["patch"]},{"url":"https://github.com/go-gitea/gitea/releases/tag/v1.26.3","name":"Gitea v1.26.3 Release","tags":["release-notes"]},{"url":"https://blog.gitea.com/release-of-1.26.3-and-1.26.4/","name":"Gitea v1.26.4 Release Blog Post","tags":["release-notes"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","description":"CWE-284","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Gitea","orgId":"88ee5874-cf24-4952-aea0-31affedb7ff2","dateUpdated":"2026-07-05T14:43:07.900Z"},"credits":[{"lang":"en","value":"Joshua Martinelle (Tenable)","type":"reporter"},{"lang":"en","type":"reporter","value":"rz1027"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-f75j-4cw6-rmx4","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-06T19:03:07.590667Z","id":"CVE-2026-20896","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-07T17:00:46.549Z"}}]}}}