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CVE-2026-8959

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

CVSS 9.6 CRITICALEPSS 0.4%CWE-119CWE-20CWE-693
Vexday Risk Score
28Bajo
Decisión SSVC (CISA)
Track
Sin señal de explotación → monitorear
CVSS 9.6EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —
Ciclo de vida
19 may 2026Publicada en NVD
Recomendación: Monitorear — sin señal de explotación por ahora.
Sandbox 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Productos afectados
Mozilla · FirefoxMozilla · Thunderbird

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Referencias
https://bugzilla.mozilla.org/show_bug.cgi?id=2034754https://www.mozilla.org/security/advisories/mfsa2026-46/https://www.mozilla.org/security/advisories/mfsa2026-48/https://www.mozilla.org/security/advisories/mfsa2026-50/https://www.mozilla.org/security/advisories/mfsa2026-51/