CVE-2026-8952

Modified Modified - Updated After Analysis

Privilege Escalation in Firefox Update Component

Publication date: 2026-05-19

Last updated on: 2026-05-20

Assigner: Mozilla Corporation

Description

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-19

Last Modified

2026-05-20

Generated

2026-06-30

AI Q&A

2026-05-19

EPSS Evaluated

2026-06-28

NVD

CVE-2026-8952

EUVD

EUVD-2026-30902

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 151.0.0 (exc)
mozilla	thunderbird	to 151.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

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

Executive Summary

This vulnerability is a privilege escalation issue found in the Application Update component of Firefox. It allows an attacker to gain higher privileges than intended within the application. The issue was addressed and fixed in Firefox version 151.

Impact Analysis

An attacker exploiting this vulnerability could gain elevated privileges within the Firefox application, potentially allowing them to perform unauthorized actions or access restricted areas of the system that are normally protected.

Mitigation Strategies

To mitigate this privilege escalation vulnerability in the Application Update component, you should update Firefox to version 151 or later where the issue is fixed.

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