What is CVE-2021-23980?

CVE-2021-23980 is a medium-severity vulnerability in Mozilla Bleach, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-02-16.

How severe is CVE-2021-23980?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Mozilla Bleach

CVE-2021-23980

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 class: XSS (Cross-Site Scripting)

EPSS: 0.005 (38.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Mozilla Bleach
Mozilla Bleach — versions unspecified

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@mozilla.org (Vendor Advisory)
security@mozilla.org (Exploit, Issue Tracking)

Frequently asked questions

What is CVE-2021-23980?: CVE-2021-23980 is a medium-severity vulnerability in Mozilla Bleach, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2023-02-16.
How severe is CVE-2021-23980?: Medium severity. CVSS v3 base score is 6.1 out of 10.