CVE-2021-23980

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.

Score

CVSS 3.1 6.1 Medium

Status

Modified - security@mozilla.org

Published

2023-02-16

Last modified

2025-03-19

Weaknesses

CWE-79

Affected products

• Bleach (Mozilla)
• Mozilla Bleach (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-23980
• https://github.com/mozilla/bleach/security/advisories/GHSA-vv2x-vrpj-qqpq