Python Bleach XSS via bleach.clean with svg/math tags
CVE-2021-23980 Published on February 16, 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.
Vulnerability Analysis
CVE-2021-23980 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2021-23980. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2021-23980 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2021-23980
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Affected Versions
Mozilla Bleach:- Version unspecified and below 3.3.0 is affected.
Vulnerable Packages
The following package name and versions may be associated with CVE-2021-23980
| Package Manager | Vulnerable Package | Versions | Fixed In |
|---|---|---|---|
| pip | bleach | < 3.3.0 | 3.3.0 |
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.