CVE-2026-16407 describes a mitigation bypass vulnerability affecting the DOM: Service Workers component in Mozilla Firefox. The issue was resolved in Firefox 153, indicating that all versions prior to 153 are vulnerable. The vulnerability involves bypassing security mitigations in the service workers functionality of the browser's DOM, potentially weakening the browser's security model in this area. No CVSS score is provided, and no known exploits in the wild have been reported. The vendor advisory from Mozilla confirms the fix in Firefox 153.

The vulnerability allows bypassing security mitigations in the DOM's Service Workers component, which could reduce the effectiveness of security controls related to service workers. This may increase the risk of attacks that rely on service worker manipulation, although specific exploitation details are not provided. The impact is assessed as moderate by Mozilla.

A fix for this vulnerability is available in Mozilla Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.