Description
Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Published: 2026-10-27
Score: 9.8 Critical
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-4866-1 firefox-esr security update
Debian DLA Debian DLA DLA-4877-1 thunderbird security update
History

Thu, 05 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 27 Oct 2026 22:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269

Tue, 27 Oct 2026 21:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269

Tue, 27 Oct 2026 18:45:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, and Thunderbird 159. Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
References

Tue, 27 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6. Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, and Thunderbird 159.
References

Tue, 27 Oct 2026 17:30:00 +0000

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

Tue, 27 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269

Tue, 27 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the Toolkit component. This vulnerability was fixed in Firefox 159 and Firefox ESR 153.6.
Title Privilege escalation in the Toolkit component
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-11-05T15:40:03.143Z

Reserved: 2026-10-27T14:05:47.813Z

Link: CVE-2026-117981

cve-icon Vulnrichment

Updated: 2026-11-05T15:39:56.779Z

cve-icon NVD

Status : Deferred

Published: 2026-10-27T14:16:56.033

Modified: 2026-11-05T16:17:39.513

Link: CVE-2026-117981

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T18:00:23Z

Weaknesses