HarborGuard / CVE
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CRITICALCVE-2026-8959Published Modified CNA mozilla

CVE-2026-8959: Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

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.

Metrics

CVSS v3.1
9.6
Severity
CRITICAL
Fixed in
140.11
Affected Products
2

Fix available

140.11151
Affected packages
  • Mozilla / Firefox
    Fixed in 140.11, 151
  • Mozilla / Thunderbird
    Fixed in 140.11, 151
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
References