Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Mozilla Firefox affected
Version Status Constraints
153.5 unaffected ≤ 153.*
158 unaffected ≤ *

No data.

No data.

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://bugzilla.mozilla.org/show_bug.cgi?id=2070547 cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-106/ cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-108/ cve-icon cve-icon
History

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

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-10-13T14:06:32.822Z

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: 2026-10-13T16:19:16.897

Link: CVE-2026-109778

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T16:15:18Z

Weaknesses