CVE-2026-92053 Firefox - Privilege Escalation

Firefox < 156 and Firefox ESR < 153.3 contain a privilege escalation caused by a flaw in the Graphics: CanvasWebGL component, letting attackers escalate privileges, exploit requires no special conditions.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.25% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-269

Vendor fix

Update to Firefox 156, Firefox ESR 153.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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