CVE-2026-124853: Sandbox escape due to incorrect boundary conditions in the Graphics: Text component
Source GCVE Database
Not known to be exploited · CVSS 9.6 Critical.
Data as of 10 Nov 2026, 18:02 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 9.6 |
|---|
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 115.45. Users and administrators should apply these updates promptly to mitigate the risk. No additional mitigation steps are required beyond updating to the fixed versions as per the Mozilla security advisories.
Description
CVE-2026-124853 is a critical vulnerability in Firefox's Graphics: Text component caused by incorrect boundary conditions, allowing sandbox escape. This flaw was addressed and fixed in Firefox 160 and Firefox ESR 115.45. The vulnerability has a high CVSS score of 9.6, indicating severe impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported. Users should update to the fixed versions to mitigate the risk.
References
- nvd.nist.gov/vuln/detail/CVE-2026-124853 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=2058035 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-125 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-126 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2026-127 (opens in a new tab)