CVE-2026-6761

Received Received - Intake

Privilege Escalation in Firefox Networking Component Fixed in

Publication date: 2026-04-21

Last updated on: 2026-04-22

Assigner: Mozilla Corporation

Description

Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-04-21

Last Modified

2026-04-22

Generated

2026-07-06

AI Q&A

2026-04-21

EPSS Evaluated

2026-07-05

NVD

CVE-2026-6761

EUVD

EUVD-2026-24102

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 150.0 (exc)
mozilla	firefox	to 140.10.0 (exc)
mozilla	thunderbird	to 140.10.0 (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 Networking component of Mozilla Firefox. It allows an attacker to gain higher privileges than intended within the affected software.

The issue was addressed and fixed in Firefox version 150 and Firefox ESR 140.10.

Impact Analysis

Privilege escalation vulnerabilities can allow attackers to gain unauthorized access or control over parts of the system or application that should be restricted.

In this case, exploiting the vulnerability in the Networking component of Firefox could enable an attacker to perform actions with elevated privileges, potentially compromising the security and integrity of the user's environment.

Mitigation Strategies

To mitigate this privilege escalation vulnerability in the Networking component, you should update your Firefox browser to version 150 or later, or Firefox ESR to version 140.10 or later.

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