{"cve":"CVE-2021-39183","nvd":{"published":"2021-12-14T20:15:07.490","modified":"2026-06-17T04:03:16.027","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p","https://github.com/owncast/owncast/security/advisories/GHSA-2hfj-cxw7-g45p"],"products":["owncast_project:owncast"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-39183","score":0.00772,"percentile":0.55707,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2hfj-cxw7-g45p","url":"https://osv.dev/vulnerability/GHSA-2hfj-cxw7-g45p","summary":"Unsafe inline XSS in pasting DOM element into chat","modified":"2026-07-08T06:27:31.747948110Z","packages":[{"ecosystem":"Go","name":"github.com/owncast/owncast","purl":"pkg:golang/github.com/owncast/owncast","ranges":["<0.0.9"],"fixed":["0.0.9"]}]},{"id":"GO-2022-0291","url":"https://osv.dev/vulnerability/GO-2022-0291","summary":"Unsafe inline XSS in pasting DOM element into chat in github.com/owncast/owncast","modified":"2026-03-03T04:52:06.842670Z","packages":[{"ecosystem":"Go","name":"github.com/owncast/owncast","purl":"pkg:golang/github.com/owncast/owncast","ranges":["<0.0.9"],"fixed":["0.0.9"]}]}],"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."]}