{"id":"CVE-2026-113429","title":"Gitea stored XSS through legacy Actions artifact Content-Encoding","summary":"Legacy (v1 to v3) Actions artifact uploads stored the request's `Content-Encoding` header unchecked in the column that is served as the artifact's `Content-Type` on download, and a value starting with `video/` or `audio/` also removed th…","severity":"none","cwe":["CWE-79"],"vendor":"Gitea","product":"gitea.dev","affected":["gitea.dev < 28.3.0"],"published":"2026-11-01","updated":"2026-11-01","sourceUpdated":"2026-11-01T09:48:32.206Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113429","references":[{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-9v6p-xpcp-7488","label":"GitHub Security Advisory GHSA-9v6p-xpcp-7488"},{"url":"https://github.com/go-gitea/gitea/pull/39855","label":"Fix: go-gitea/gitea pull request #39855"},{"url":"https://github.com/go-gitea/gitea/pull/39996","label":"Fix backport to release/v28: go-gitea/gitea pull request #39996"},{"url":"https://blog.gitea.com/release-of-28.3.0/","label":"Gitea 28.3.0 release announcement"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v28.3.0","label":"go-gitea/gitea v28.3.0 release"}],"tags":["cve.org"],"epss":0.00171,"epssPercentile":0.06547,"ingestedAt":"2026-11-05T18:28:50.704Z","slug":"CVE-2026-113429","body":"## Overview\n\nLegacy (v1 to v3) Actions artifact uploads stored the request's `Content-Encoding` header unchecked in the column that is served as the artifact's `Content-Type` on download, and a value starting with `video/` or `audio/` also removed the sandboxing Content-Security-Policy. A user who can run an Actions job could upload an artifact that a browser renders as HTML on the Gitea origin when the direct artifact download URL is opened, and the URL is reachable anonymously on public repositories. A victim who opens the link runs the attacker's script with their own session, which for an administrator means control of the instance. Legacy uploads now store only the `gzip` marker, and the special serve headers are chosen only for valid media types.\n\n## Affected\n\n- `gitea.dev < 28.3.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}