CVE-2026-109783
Deferred Deferred - Pending Action

Mitigation Bypass in Firefox ESR File Handling

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 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-2026-109783
EUVD
EUVD-2026-98543

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
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 the File Handling component of Firefox ESR. It allows attackers to bypass security measures that were meant to prevent certain types of file-based attacks.

Impact Analysis

If exploited, this vulnerability could allow an attacker to bypass file handling restrictions, potentially leading to unauthorized access to sensitive files or execution of malicious code on your system.

Mitigation Strategies

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

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