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CVE-2021-23980

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Date: February 15, 2023

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.

Language: Python

Severity Score

Related Resources (13)

https://pypi.org/project/bleach
ttps://bugzilla.mozilla.org/show_bug.cgi?id=1689399
https://advisory.checkmarx.net/advisory/CX-2021-4303
https://github.com/mozilla/bleach
https://github.com/mozilla/bleach/security/advisories/GHSA-vv2x-vrpj-qqpq
https://nvd.nist.gov/vuln/detail/CVE-2021-23980
https://bugzilla.mozilla.org/show_bug.cgi?id=1689399
https://cure53.de/fp170.pdf
https://github.com/mozilla/bleach/commit/79b7a3c5e56a09d1d323a5006afa59b56162eb13
https://bugzilla.mozilla.org/show_bug.cgi?id=CVE-2021-23980
https://github.com/mozilla/bleach/blob/79b7a3c5e56a09d1d323a5006afa59b56162eb13/CHANGES#L4
https://github.com/pypa/advisory-database/tree/main/vulns/bleach/PYSEC-2021-865.yaml
https://www.mend.io/vulnerability-database/CVE-2021-23980

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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