CVE-2026-66154

Insufficient Certificate Validation Allowing Unauthorized Changes in SonicWall GMS

Published Aug 11, 2026 CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Description
An insufficient certificate validation in a privileged communication workflow, was identified in a GMS application 9.5.1 (Build 9510.1044) and earlier versions which, under a successful MitM attack and controlled network conditions, could permit unauthorized changes.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Sonicwall
Sonicwall gms
Vendors & Products Sonicwall
Sonicwall gms
Type Values Removed Values Added
Title Insufficient Certificate Validation Allowing Unauthorized Changes in SonicWall GMS
Type Values Removed Values Added
Metrics cvssV3_1

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

ssvc

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

Type Values Removed Values Added
Description An insufficient certificate validation in a privileged communication workflow, was identified in a GMS application 9.5.1 (Build 9510.1044) and earlier versions which, under a successful MitM attack and controlled network conditions, could permit unauthorized changes.
Weaknesses CWE-295
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
sonicwall
Published
Updated
Aug 12, 2026, 2:47 PM
Reserved
Jul 24, 2026, 8:34 AM
Status
Awaiting Analysis
Published
Aug 11, 2026, 9:17 PM
Modified
Oct 24, 2026, 4:10 PM