CVE-2026-118011: Mozilla Firefox · Frame poisoning in the CSS Parsing and Computation component
Affects Mozilla FirefoxSource CVE Database V5
Not known to be exploited.
Data as of 27 Oct 2026, 14:42 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
Users and administrators should update to Firefox version 159 or later to remediate this vulnerability. Mozilla has officially fixed the issue in this release. No additional mitigation steps are required beyond applying the official update.
Description
CVE-2026-118011 is a high-impact vulnerability involving frame poisoning in the CSS Parsing and Computation component of Mozilla Firefox. This flaw was addressed and fixed in Firefox version 159. The vulnerability is part of a broader set of security issues resolved in this release, all rated with high impact. No active exploitation in the wild has been reported.