CVE-2021-23980

Summary

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.

Affected Software

Weaknesses

• mutation XSS via allowed math or svg; p or br; and style, title, noscript, script, textarea, noframes, iframe, or xmp tags with strip_comments=False

ADP Enrichment

CVE Program Container

Additional References

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

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

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

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