CVE-2026-109780

EUVD-2026-98540
Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
UNKNOWN
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 8.96%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mozillafirefox
𝑥
< 158
CNA
mozillathunderbird
𝑥
< 158
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
vulnerable
Vulnerability Media Exposure
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2072775
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-109/