CVE-2026-16365 is a privilege escalation vulnerability affecting the DOM Workers component in Firefox. The flaw allows an attacker to gain elevated privileges within the browser context, potentially bypassing security restrictions. Mozilla fixed this vulnerability in Firefox 153 as part of a broader security update addressing multiple high-impact issues. The vendor advisory confirms the fix and classifies the impact as high.

The vulnerability enables privilege escalation within the Firefox browser's DOM Workers component, which could allow an attacker to execute actions with elevated privileges. This could undermine browser security controls and potentially lead to further exploitation or compromise of user data or browser integrity. However, no active exploitation in the wild has been reported.

This vulnerability has been fixed in Firefox version 153. Users and administrators should update to Firefox 153 or later to remediate this issue. No additional mitigation steps are required beyond applying the official update.