CVE-2026-109736: Vulnerability in Mozilla Firefox
Description
Frame poisoning in the Layout 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 frame poisoning within the Layout component of Mozilla Firefox. The flaw was resolved by Mozilla in Firefox 158 and Firefox ESR 153.5 releases. The vendor has published security advisories MFSA2026-106 and MFSA2026-108 detailing the issue and its remediation.
Potential Impact
Successful exploitation could allow an attacker to manipulate frame content within the browser's layout engine, potentially leading to security issues related to content rendering or script execution. However, no active exploitation has been reported.
Mitigation Recommendations
Users should update to Firefox 158 or later, or Firefox ESR 153.5 or later, where the vulnerability has been fixed. Applying these official updates fully mitigates the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-13T00:29:42.815Z
- 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: 6ace2c482cdf04f65661d53c
Added to database: 10/13/2026, 13:04:08 UTC
Last enriched: 10/13/2026, 13:49:08 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 2
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