Critical severity9.3NVD Advisory· Published Sep 15, 2026· Updated Oct 5, 2026
CVE-2026-92059
CVE-2026-92059
Description
Incorrect boundary conditions in the DOM: Editor component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
Affected products
8cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <153.3.0
- (no CPE)range: >=156
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <153.3.0
- (no CPE)range: >=156, >=153.3
- osv-coords4 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 153.3.0-160000.1.1+ 3 more
- (no CPE)range: < 153.3.0-160000.1.1
- (no CPE)range: < 156.0-1.1
- (no CPE)range: < 153.4.0-1.1
- (no CPE)range: < 153.3.0-1.1
Patches
Vulnerability mechanics
References
5- www.mozilla.org/security/advisories/mfsa2026-90/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-93/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-94/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-96/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
2- Mozilla Firefox: 25 Coordinated Vulnerability Disclosures Impacting Multiple ComponentsVypr Intelligence · Sep 15, 2026
- Mozilla Firefox ESR: 25 Coordinated Vulnerabilities Disclosed, Including Privilege Escalation and Sandbox EscapesVypr Intelligence · Sep 15, 2026