Vulnerability details

CVE-2026-92071

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

CVSS 3.1

9.6Critical

Official description

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

CVSS scores

Score	Version	Source	Vector
9.6Critical	3.1	CISA ADP / Vulnrichment (CISA-ADP)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
No product information recorded.

References and advisories

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Details

Published: 2026-09-15
Last updated: 2026-09-22
State: Published
Assigner (CNA): mozilla

Exploit prediction (EPSS)

0.23%

Probability of exploitation in 30 days

15%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-119
Improper Restriction of Operations within the Bounds of a Memory Buffer