CVE-2026-74947

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Privilege Escalation in Firefox Graphics Component

Publication date: 2026-08-18

Last updated on: 2026-08-21

Assigner: Mozilla Corporation

Description

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-18

Last Modified

2026-08-21

Generated

2026-09-07

AI Q&A

2026-08-18

EPSS Evaluated

2026-09-06

NVD

CVE-2026-74947

EUVD

EUVD-2026-60677

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 154.0.0 (exc)
mozilla	thunderbird	to 154.0 (exc)
mozilla	firefox	to 153.1.0 (exc)
mozilla	thunderbird	to 153.1.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-763	The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.

Attack-Flow Graph

Executive Summary

This is a privilege escalation vulnerability caused by an invalid pointer in Firefox's Graphics component. It allows attackers to gain higher privileges than intended. The issue was patched in Firefox 154 and Firefox ESR 153.1.

Detection Guidance

This vulnerability is specific to Firefox and Firefox ESR versions before 154 and 153.1 respectively. Detection involves checking installed versions of Firefox or Firefox ESR on systems. Use commands like 'firefox --version' or 'apt list --installed | grep firefox' on Linux or check 'About Firefox' in the application menu on Windows or macOS.

Impact Analysis

If exploited, this vulnerability could let attackers take control of your system, install malware, or access sensitive data. Users running vulnerable Firefox versions are at risk until they update.

Compliance Impact

This vulnerability does not provide specific details about compliance impacts on standards like GDPR or HIPAA. The issue involves privilege escalation in the Graphics component of Firefox, which could potentially lead to unauthorized access or data breaches. However, without further context on data handling or affected systems, direct implications for compliance cannot be determined.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to version 153.1 or later to address the privilege escalation vulnerability in the Graphics component.

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