CVE-2026-74950

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Privilege Escalation in Firefox Downloads API

Publication date: 2026-08-18

Last updated on: 2026-08-21

Assigner: Mozilla Corporation

Description

Privilege escalation in the Downloads API component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

CVSS Scores

EPSS Scores

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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-2026-74950

EUVD

EUVD-2026-60678

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-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 is a privilege escalation vulnerability in Firefox's Downloads API component. It allows an attacker to gain higher privileges than intended, potentially taking control of the affected system.

Detection Guidance

This vulnerability is specific to Firefox versions before 154 and Firefox ESR before 153.1. Check your Firefox version with: firefox --version. If it is below 154 or ESR below 153.1, the system is vulnerable. Update immediately to the latest version.

Impact Analysis

If exploited, this vulnerability could let an attacker perform unauthorized actions on your system, such as installing malware, accessing sensitive data, or taking control of your browser or device.

Compliance Impact

The vulnerability allows privilege escalation, which could lead to unauthorized access to sensitive data. This may impact compliance with GDPR by risking data confidentiality and HIPAA by potentially exposing protected health information.

Mitigation Strategies

Update Firefox to version 154 or later and Firefox ESR to version 153.1 or later to patch the privilege escalation vulnerability in the Downloads API component.

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