CVE-2026-109763
Received Received - Intake

Mitigation Bypass in Firefox File Handling Component

Publication date: 2026-10-13

Last updated on: 2026-10-13

Assigner: Mozilla Corporation

Description
Mitigation bypass in the File Handling 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-2026-109763
EUVD
EUVD-2026-98523

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

This is a mitigation bypass vulnerability in Firefox's File Handling component. It allows attackers to bypass security measures that were meant to prevent certain types of file-based attacks. The issue was addressed in Firefox version 158 and Firefox ESR version 153.5.

Impact Analysis

An attacker could exploit this to bypass file handling restrictions, potentially leading to unauthorized file access or execution of malicious files on your system. This could result in data theft, malware installation, or other security breaches.

Mitigation Strategies

Update Firefox to version 158 or later and Firefox ESR to version 153.5 or later to address the mitigation bypass in the File Handling component.

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