MajorCritical vulnerability
CVE-2026-109778 (CVSS 8.8)
NVD · officialPublished Oct 13, 2026Risk 37/100
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
Technical details
CVSS
8.8
AV:NetworkAC:LowPR:NoneUI:RequiredC:HighI:HighA:High
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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