High severity · published Oct 27, 2026
CVE-2026-118008
Privilege escalation in the DOM: Navigation component
New
8.8
CVSS
–
EPSS
No
On KEV
Description
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-118008
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-118008
bugzilla.mozilla.org
https://bugzilla.mozilla.org/show_bug.cgi?id=2075440
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-118/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-121/