Description
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Published: 2026-10-13
Score: 8.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 13 Oct 2026 21:30:00 +0000

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

Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Tue, 13 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
References

Tue, 13 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Tue, 13 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

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


Tue, 13 Oct 2026 13:00:00 +0000

Type Values Removed Values Added
Description Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
Title Privilege escalation in the WebExtensions component
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-13T18:17:29.200Z

Reserved: 2026-10-13T00:49:10.870Z

Link: CVE-2026-109778

cve-icon Vulnrichment

Updated: 2026-10-13T14:06:22.805Z

cve-icon NVD

Status : Deferred

Published: 2026-10-13T13:17:28.713

Modified: 2026-10-13T19:18:42.270

Link: CVE-2026-109778

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T21:15:16Z

Weaknesses