Executive brief
A security vulnerability has been identified in the Mozilla Firefox web browser's Disability Access APIs. This flaw could allow a malicious website to bypass the browser's security 'sandbox,' which is designed to keep web content isolated from the rest of the computer. If successfully exploited, an attacker could potentially gain unauthorized access to the underlying operating system, leading to data theft or the installation of malicious software.
Technical details
A vulnerability exists in the Disability Access APIs component of Mozilla Firefox due to an invalid pointer. This flaw allows for a sandbox escape, enabling an attacker who can execute code within the content process (typically via a malicious website) to break out of the restricted environment and execute arbitrary code with the privileges of the user running the browser. The vulnerability is triggered by improper memory handling within the accessibility framework. Mozilla has addressed this issue in Firefox 153 by improving pointer validation and memory safety within the affected component.
Affected products
- Mozilla Firefox < 153
Timeline
- 2026-07-21: disclosed
- 2026-07-21: patched: Fixed in Firefox 153