CVE-2026-109734: Vulnerability in Mozilla Firefox
Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Affected software
Mozilla
Firefox
Mozilla
Thunderbird
pkg:github/mozilla/firefox-esrRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a bypass of mitigation controls within the Document Object Model (DOM) security component of Mozilla Firefox. The flaw was resolved by Mozilla in Firefox 158 and Firefox ESR 153.5. The vendor has published advisories detailing the issue and its remediation.
Potential Impact
The vulnerability could allow an attacker to bypass security mitigations in the DOM component, potentially undermining browser security protections. However, no active exploitation has been reported, and the issue is fixed in the specified versions.
Mitigation Recommendations
Users should update to Firefox 158 or later, or Firefox ESR 153.5 or later, to ensure the vulnerability is remediated. The vendor advisories confirm that the issue is fixed in these versions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-13T00:29:40.196Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-108/","vendor":"Mozilla"}]
Threat ID: 6ace2c482cdf04f65661d53a
Added to database: 10/13/2026, 13:04:08 UTC
Last enriched: 10/13/2026, 13:49:16 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 2
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