CVE-2026-74955
Undergoing Analysis Undergoing Analysis - In Progress

Privilege Escalation in Firefox

Vulnerability report for CVE-2026-74955, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Mozilla Corporation

Description

Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-18
AI Q&A
2026-08-18
EPSS Evaluated
N/A
NVD
EUVD

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
mozilla firefox to 154 (inc)
mozilla firefox_esr to 153.1 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-269 The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.

Attack-Flow Graph

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Executive Summary

This is a privilege escalation vulnerability in the Request Handling component of Firefox. It allows an attacker to gain higher privileges than intended, potentially leading to unauthorized access or control.

Impact Analysis

If exploited, this vulnerability could allow attackers to perform actions with elevated permissions, such as accessing sensitive data, installing malware, or taking control of your system. Users of affected Firefox versions are at risk.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance standards like GDPR or HIPAA. However, privilege escalation vulnerabilities can potentially lead to unauthorized access to sensitive data, which may violate confidentiality requirements in GDPR and HIPAA.

Mitigation Strategies

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

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