CVE-2026-109704: Vulnerability in Mozilla Firefox
Description
Privilege escalation in the Application Update 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 privilege escalation within the Application Update component of Mozilla Firefox. It allows an attacker to gain elevated privileges under certain conditions. Mozilla has fixed this issue in Firefox 158 and Firefox ESR 153.5, mitigating the risk posed by this vulnerability.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to escalate privileges on the affected system via the Application Update component. This could lead to unauthorized actions being performed with elevated rights. However, no known exploits in the wild have been reported at this time.
Mitigation Recommendations
Users and administrators should update Mozilla Firefox to version 158 or later, or Firefox ESR to version 153.5 or later, to apply the official fix for this vulnerability. Applying these updates fully mitigates the risk associated with this issue.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-10-13T00:29:13.930Z
- 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: 6ace2c402cdf04f65661caf1
Added to database: 10/13/2026, 13:04:00 UTC
Last enriched: 10/13/2026, 14:19:51 UTC
Last updated: 10/14/2026, 04:04:32 UTC
Views: 2
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