CVE-2026-84123
Received Received - Intake

Privilege Escalation in Firefox via WebGPU Use-After-Free

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: Mozilla Corporation

Description
Privilege escalation due to use-after-free in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-84123
EUVD
EUVD-2026-69072

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox 155
mozilla firefox_esr 153.2

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a privilege escalation vulnerability caused by a use-after-free error in the Graphics: WebGPU component of Firefox. A use-after-free occurs when a program continues to use memory after it has been freed, potentially allowing attackers to execute arbitrary code or escalate privileges.

Impact Analysis

If exploited, this vulnerability could allow an attacker to gain elevated privileges on your system, potentially leading to unauthorized access, data theft, or installation of malicious software. Users of affected Firefox versions are at risk until they update to Firefox 155 or Firefox ESR 153.2.

Mitigation Strategies

Update Firefox to version 155 or later and Firefox ESR to version 153.2 or later to address the use-after-free vulnerability in Graphics: WebGPU.

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