CVE-2026-84123
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
- Published Sep 1, 2026
- CVSS 8.8 high
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available