{"cve":"CVE-2021-23974","nvd":{"published":"2021-02-26T02:15:13.320","modified":"2026-06-17T03:39:05.663","status":"Modified","description":"The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.","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":[],"references":["https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627","https://security.gentoo.org/glsa/202104-10","https://www.mozilla.org/security/advisories/mfsa2021-07/","https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627","https://security.gentoo.org/glsa/202104-10"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-23974","score":0.00753,"percentile":0.55062,"date":"2026-10-31"},"kev":null,"osv":[],"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."]}