CVE-2026-124887: Incorrect Boundary Conditions
Source GCVE Database
Not known to be exploited · CVSS 8.8 High.
Data as of 10 Nov 2026, 17:17 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 8.8 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 10 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 10 Nov 2026.
What to do
AI-suggested
This vulnerability has been fixed in Firefox 160 and Firefox ESR 153.7. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official patches provided by Mozilla.
Description
CVE-2026-124887 is a high severity vulnerability involving incorrect boundary conditions in the Layout: Text and Fonts component of Firefox. This flaw was addressed and fixed in Firefox 160 and Firefox ESR 153.7. The vulnerability could allow an attacker to cause significant impact on confidentiality, integrity, and availability if exploited.