CVE-2026-4728: Spoofing issue in the Privacy: Anti-Tracking component

Published Mar 24, 2026
·
Updated

Spoofing issue in the Privacy: Anti-Tracking component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.

Affected Software

5 affected componentsFixes available
Mozilla Firefox<149
Mozilla Firefox<149
149
Mozilla Thunderbird<149
149
Mozilla Firefox<149.0
Mozilla Thunderbird<149.0

Event History

Mar 24, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:30 PM
Data Sourced
via MITRE·12:30 PM
Description
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
Apr 7, 58249
Event
via FIRST·05:38 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-4728?

CVE-2026-4728 is a medium-severity vulnerability that involves a spoofing issue in Firefox's Anti-Tracking component.

2

How do I fix CVE-2026-4728?

To fix CVE-2026-4728, update your Firefox browser to version 149 or later.

3

Which versions of Firefox are affected by CVE-2026-4728?

CVE-2026-4728 affects all versions of Firefox prior to version 149.

4

What type of vulnerability is CVE-2026-4728?

CVE-2026-4728 is classified as a spoofing vulnerability.

5

Can CVE-2026-4728 lead to data theft?

While CVE-2026-4728 primarily allows for identity deception, it could potentially lead to data theft under certain conditions.

Company

Resources

Contact

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CVE-2026-4728 - Spoofing issue in the Privacy: Anti-Tracking component - SecAlerts