Executive brief
A security vulnerability exists in the Firefox web browser's security component. This flaw allows an attacker to bypass built-in security mitigations designed to protect users while browsing. If exploited, this could weaken the browser's defense-in-depth mechanisms, potentially making it easier for other attacks to succeed against the user.
Technical details
A mitigation bypass vulnerability exists in the DOM: Security component of Mozilla Firefox. The flaw allows for the circumvention of security protections implemented within the Document Object Model (DOM) layer. While specific exploitation details are restricted in the associated Bugzilla report (Bug 2046748), the vulnerability is classified as a 'mitigation bypass,' suggesting it undermines defense-in-depth controls rather than providing a direct path to code execution or data theft on its own. The issue is resolved in Firefox 153.
Affected products
- Mozilla Firefox < 153
Timeline
- 2026-07-21: advisory
- 2026-07-21: patched