CVE-2026-92071

Analyzed Analyzed - Analysis Complete

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:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-06

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92071

EUVD

EUVD-2026-78456

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 restricted sandbox, potentially gaining higher system privileges.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system with the same privileges as the Firefox application. This could lead to data theft, installation of malware, or unauthorized system access.

Compliance Impact

This vulnerability does not provide specific details about compliance impacts on standards like GDPR or HIPAA. The issue involves a sandbox escape in the Widget: Win32 component, which could potentially allow unauthorized access to system resources.

Mitigation Strategies

Update Firefox to version 156 or later and Firefox ESR to version 153.3 or later to patch the vulnerability.

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