CVE-2026-92013
Received Received - Intake

Privilege Escalation in Firefox Graphics CanvasWebGL

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: Mozilla Corporation

Description
Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-92013
EUVD
EUVD-2026-78476

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 156
mozilla firefox_esr 115.41
mozilla firefox_esr 140.16
mozilla firefox_esr 153.3

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-120 The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

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Executive Summary

This is a privilege escalation vulnerability caused by incorrect boundary conditions in the Graphics: CanvasWebGL component of Firefox. It allows attackers to gain elevated privileges due to improper handling of certain inputs.

Detection Guidance

This vulnerability is specific to Firefox browsers and can be detected by checking the installed version. Compare your Firefox or Firefox ESR version against the fixed versions: Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, or Firefox ESR 153.3. Use commands like 'firefox --version' or check 'about:support' in Firefox to verify the version.

Impact Analysis

An attacker could exploit this to gain unauthorized access to sensitive data, execute arbitrary code, or perform actions with elevated privileges. This could lead to system compromise or data breaches if the browser is used to access sensitive applications.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and access control. Organizations using affected Firefox versions may face compliance violations and potential penalties.

Mitigation Strategies

Update Firefox to version 156 or later, Firefox ESR to version 115.41 or later, Firefox ESR to version 140.16 or later, or Firefox ESR to version 153.3 or later to address the privilege escalation vulnerability in the Graphics: CanvasWebGL component.

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