Medium severity6.5NVD Advisory· Published Dec 8, 2021· Updated Jun 17, 2026
CVE-2021-43540
CVE-2021-43540
Description
WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <95.0
- (no CPE)range: <95
- (no CPE)range: unspecified
- osv-coords2 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 95.0-1.1+ 1 more
- (no CPE)range: < 95.0-1.1
- (no CPE)range: < 128.5.1-1.1
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- security.gentoo.org/glsa/202202-03nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-52/nvdVendor Advisory
News mentions
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