Description
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
Published: 2026-10-13
Score: 8.3 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

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Remediation

No solution or workaround provided in the CVE record.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4836-1 firefox-esr security update
Debian DSA Debian DSA DSA-6560-1 firefox-esr security update
History

Mon, 26 Oct 2026 21:30:00 +0100

Type Values Removed Values Added
Weaknesses CWE-693
Metrics cvssV3_1

{'score': 8.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 17 Oct 2026 10:00:00 +0200

Type Values Removed Values Added
Weaknesses CWE-20

Wed, 14 Oct 2026 00:30:00 +0200

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla thunderbird
Vendors & Products Mozilla
Mozilla firefox
Mozilla thunderbird

Tue, 13 Oct 2026 23:15:00 +0200

Type Values Removed Values Added
Weaknesses CWE-20
CWE-609

Tue, 13 Oct 2026 20:30:00 +0200

Type Values Removed Values Added
Description Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5. Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.
References

Tue, 13 Oct 2026 20:15:00 +0200

Type Values Removed Values Added
Weaknesses CWE-20
CWE-609

Tue, 13 Oct 2026 15:00:00 +0200

Type Values Removed Values Added
Description Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5.
Title Mitigation bypass in the File Handling component
References

Subscriptions

Mozilla Firefox Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-26T19:41:02.033Z

Reserved: 2026-10-13T00:49:20.493Z

Link: CVE-2026-109782

cve-icon Vulnrichment

Updated: 2026-10-26T19:24:11.839Z

cve-icon NVD

Status : Deferred

Published: 2026-10-13T13:17:29.117

Modified: 2026-10-26T20:17:47.160

Link: CVE-2026-109782

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T09:45:05Z

Weaknesses
  • CWE-20

    Improper Input Validation

  • CWE-693

    Protection Mechanism Failure