CVE-2026-8959
critical · 9.6Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
9.6
CVSS
0.4%
EPSS (exploit prob.)
36th
EPSS percentile
2026-05-19
Published
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Weaknesses
CWE-20CWE-119CWE-693
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| mozilla | firefox | < 140.11.0 |
| mozilla | firefox | < 151.0.0 |
| mozilla | thunderbird | < 140.11 |
| mozilla | thunderbird | < 151.0.0 |
Check a specific version with /api/v1/cve/match.
References
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2026-8959