Privilege Escalation in Firefox Address Bar Component
CVE-2026-100820

Currently unrated

Key Information:

Vendor: Mozilla
Status: Firefox
Vendor: CVE Published:; 29 September 2026

What is CVE-2026-100820?

A privilege escalation issue exists in the Address Bar component of Firefox, which could allow attackers to gain higher permissions than intended. This vulnerability has been addressed in multiple versions, including Firefox ESR 153.4 and Firefox 157. Users are encouraged to update their browsers to the latest versions to ensure their security and protect against potential exploits.