High severity · published Oct 27, 2026
CVE-2026-118008
Privilege escalation in the DOM: Navigation component
New
8.8
CVSS
0.4%
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?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
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/