CVE-2021-23980
6.1 · MEDIUMOverview
CVE-2021-23980 is a medium-severity vulnerability affecting mozilla bleach. It was published on February 16, 2023 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from mozilla. Update bleach to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mozilla | bleach | >= 0, < 3.3.0 | Affected |
Frequently Asked Questions
What is CVE-2021-23980?
CVE-2021-23980 is a medium-severity vulnerability affecting mozilla bleach. It was published on February 16, 2023 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2021-23980?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-23980?
Check the references section for vendor advisories and patches from mozilla. Update bleach to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-23980?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-23980 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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