High severity · published Sep 15, 2026
CVE-2026-92011
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component
8.8
CVSS
0.3%
EPSS
No
On KEV
Description
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
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)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 115.41.0; 116.0 before 140.16.0; 141.0 before 153.3.0; 154.0.0 before 156.0.0 · source: NVD
TH
Thunderbird · Mozilla
before 140.16.0; 141.0 before 153.3.0; 154.0 before 156.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-92011
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-92011
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=2058068
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-90/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-91/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-92/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-93/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-94/
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