Vulnerability Description
The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.
CVSS Score
6.1
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 86.0 |
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627Issue TrackingVendor Advisory
- https://security.gentoo.org/glsa/202104-10Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/Release NotesVendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627Issue TrackingVendor Advisory
- https://security.gentoo.org/glsa/202104-10Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/Release NotesVendor Advisory
FAQ
What is CVE-2021-23974?
CVE-2021-23974 is a vulnerability with a CVSS score of 6.1 (MEDIUM). The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.
How severe is CVE-2021-23974?
CVE-2021-23974 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-23974?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.