CVE-2026-92050

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Firefox XPConnect Race Condition Sandbox Escape

Publication date: 2026-09-15

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Sandbox escape due to race condition in the XPConnect component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-15

Last Modified

2026-10-05

Generated

2026-10-05

AI Q&A

2026-09-15

EPSS Evaluated

2026-10-04

NVD

CVE-2026-92050

EUVD

EUVD-2026-78513

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 156.0.0 (exc)
mozilla	thunderbird	to 156.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-362	The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Attack-Flow Graph

Executive Summary

This is a sandbox escape vulnerability caused by a race condition in the XPConnect component of Firefox. It allows an attacker to break out of the browser's sandbox, potentially gaining access to the underlying system.

Detection Guidance

This vulnerability is specific to Firefox versions before 156 and involves a sandbox escape due to a race condition in XPConnect. Detection would require checking Firefox version and monitoring for unusual sandbox bypass attempts.

Impact Analysis

If exploited, this vulnerability could allow an attacker to execute arbitrary code on your system with the same privileges as the user running Firefox. This could lead to data theft, malware installation, or further network compromise.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability involves a sandbox escape due to a race condition in the XPConnect component, which could potentially allow unauthorized access to system resources.

Mitigation Strategies

Update Firefox to version 156 or later to address the sandbox escape vulnerability caused by a race condition in XPConnect.

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