Medium severity6.1NVD Advisory· Published Feb 26, 2021· Updated Jun 17, 2026
CVE-2021-23974
CVE-2021-23974
Description
The DOMParser API did not properly process '' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5< 86+ 2 more
- (no CPE)range: < 86
- (no CPE)range: <86
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <86.0
- osv-coords2 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 92.0-1.2+ 1 more
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 128.5.1-1.1
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/buglist.cginvdIssue TrackingVendor Advisory
- security.gentoo.org/glsa/202104-10nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-07/nvdRelease NotesVendor Advisory
News mentions
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