CVE-2026-117981: Mozilla Firefox · Privilege Escalation in the Toolkit Component
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited.
Data as of 27 Oct 2026, 14:45 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 27 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
A fix for this vulnerability is available and included in Firefox 159 and Firefox ESR 153.6. Users and administrators should update affected Firefox installations to these versions or later to remediate the issue.
Description
CVE-2026-117981 is a privilege escalation vulnerability in the Toolkit component of Mozilla Firefox. This security flaw allows an attacker to gain elevated privileges within the affected software. The issue was addressed and fixed in Firefox version 159 and Firefox ESR 153.6. The vulnerability is rated with high impact by Mozilla. There are no known exploits in the wild at this time.