VULNERABILITY INTELLIGENCE

CVE-2021-23980

CVSS score6.1 MEDIUM

EPSS probability0.48%

CISA KEVNot currently listed

Published2023-02-16

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Description

A mutation XSS affects users calling bleach.clean with all of: svg or math in the allowed tags p or br in allowed tags style, title, noscript, script, textarea, noframes, iframe, or xmp in allowed tags the keyword argument strip_comments=False Note: none of the above tags are in the default allowed tags and strip_comments defaults to True.

Weakness classification

nvd@nist.gov: CWE-79
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-79

Primary references

security@mozilla.org — Exploit, Issue Tracking
security@mozilla.org — Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking
af854a3a-2127-422b-91ae-364da2661108 — Vendor Advisory