CVE-2026-92065

Awaiting Analysis Awaiting Analysis - Queue

Firefox Widget Win32 Sandbox Escape Vulnerability

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

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

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92065

EUVD

EUVD-2026-78528

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	thunderbird	From 154.0 (inc) to 156.0 (exc)
mozilla	firefox	to 153.3.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 156.0.0 (exc)
mozilla	thunderbird	to 153.3.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability allows an attacker to escape the sandbox environment due to incorrect boundary conditions in the Widget: Win32 component of Firefox. This means malicious code could run outside the intended restricted environment, potentially gaining unauthorized access to the system.

Detection Guidance

This vulnerability is specific to Firefox versions before 156 and Firefox ESR before 153.3. Detection involves checking installed Firefox versions. On Linux, run 'firefox --version' or 'dpkg -l firefox' (Debian/Ubuntu) or 'rpm -qa firefox' (RHEL/Fedora). On Windows, check 'Programs and Features' or run 'wmic product get name,version' in Command Prompt. If versions are below the fixed releases, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system, bypass security restrictions, or access sensitive data. Users of affected Firefox versions should update immediately to mitigate risk.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or other standards as it is a sandbox escape issue in a specific software component. Compliance impacts would depend on how the affected software is used in systems handling regulated data.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to address the sandbox escape vulnerability in the Widget: Win32 component.

Hi! I’m here to help you understand CVE-2026-92065. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70