{"id":"CVE-2021-39183","aliases":["GHSA-2hfj-cxw7-g45p","GO-2022-0291"],"url":"https://o3.security/vulnerability/CVE-2021-39183","summary":"Unsafe inline XSS in pasting DOM element into chat","details":"Owncast is an open source, self-hosted live video streaming and chat server. In affected versions inline scripts are executed when Javascript is parsed via a paste action. This issue is patched in 0.0.9 by blocking unsafe-inline Content Security Policy and specifying the script-src. The worker-src is required to be set to blob for the video player.","published":"2021-12-14T20:15:07.490Z","modified":"2026-07-09T12:20:12.171574Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00747,"percentile":0.52159,"asOf":"2026-08-22"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Go","name":"github.com/owncast/owncast","fixedVersion":"0.0.9"}],"fix":null,"references":[{"type":"FIX","url":"https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T12:20:12.171574Z"}}