CVE-2026-92012

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, and Firefox ESR 153.3.

Scoring

Severity

HIGH

CVSS base score

8.8

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS probability

0.27%

Published

2026-09-15

Last modified

2026-09-16

Affected products

• Mozilla Firefox
• Mozilla Firefox
• Mozilla Firefox
• Mozilla Firefox
• Mozilla Thunderbird
• Mozilla Thunderbird
• Mozilla Thunderbird

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