CVE-2021-23980

MEDIUM

Mozilla Bleach < 3.3.0 - Cross-Site Scripting via SVG/Math Tags with Strip Comments Disabled

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 6.1
EPSS 0.0049
EPSS Percentile 65.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
mozilla/bleach < 3.3.0
pypi/bleach 0 - 3.3.0PyPI
Published Feb 16, 2023
Tracked Since Feb 18, 2026