CESS-2026-0878 — Vulnetix

CESS-2026-0878 PUBLISHED CVSS 8 HIGH

Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.

Risk Scores

CVSS 3.1

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

Timeline

Jan 13, 2026 CVE Published

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