CVE-2026-109704
Received Received - Intake

Privilege Escalation in Firefox Update Component

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

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Meta Information

Published
2026-10-13
Last Modified
2026-10-13
Generated
2026-10-13
AI Q&A
2026-10-13
EPSS Evaluated
N/A
NVD
CVE-2026-109704
EUVD
EUVD-2026-98482

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox to 158 (inc)
mozilla firefox_esr to 153.5 (inc)
mozilla firefox 158
mozilla firefox_esr 153.5

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

CVE-2026-109704 is a privilege escalation vulnerability in Firefox's Application Update component. It allows attackers to gain elevated privileges through the update mechanism, potentially leading to unauthorized system access or control.

Detection Guidance

Detection involves checking Firefox version. Run 'firefox --version' to verify if your version is below 158. Compare against Firefox ESR 153.5. If outdated, the system is vulnerable.

Impact Analysis

An attacker could exploit this to gain higher privileges on your system, potentially allowing them to install malware, access sensitive data, or take control of your device without your knowledge.

Mitigation Strategies

Update Firefox to version 158 or later immediately. For ESR users, update to Firefox ESR 153.5. Use your system's package manager or download from Mozilla's official site.

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