CVE-2026-66154: CWE-295 Improper certificate validation in SonicWall GMS
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.
AI Analysis
Technical Summary
This vulnerability (CWE-295) in SonicWall GMS arises from insufficient validation of certificates during a privileged communication process. If exploited via a successful MitM attack, it could permit unauthorized modifications within the system. The affected versions include 9.5.1 (Build 9510.1044) and earlier. There is no available CVSS score or vendor advisory indicating remediation status.
Potential Impact
An attacker who can successfully perform a MitM attack under controlled network conditions may exploit this certificate validation weakness to make unauthorized changes in the SonicWall GMS application. This could compromise the integrity of the system's privileged communications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting exposure to untrusted networks and monitor for updates from SonicWall.
CVE-2026-66154: CWE-295 Improper certificate validation in SonicWall GMS
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.
CVSS v3.1
Score 8.3high
Affected software
SonicWall
GMS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-295) in SonicWall GMS arises from insufficient validation of certificates during a privileged communication process. If exploited via a successful MitM attack, it could permit unauthorized modifications within the system. The affected versions include 9.5.1 (Build 9510.1044) and earlier. There is no available CVSS score or vendor advisory indicating remediation status.
Potential Impact
An attacker who can successfully perform a MitM attack under controlled network conditions may exploit this certificate validation weakness to make unauthorized changes in the SonicWall GMS application. This could compromise the integrity of the system's privileged communications.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider limiting exposure to untrusted networks and monitor for updates from SonicWall.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- sonicwall
- Date Reserved
- 2026-07-24T08:34:11.798Z
- State
- PUBLISHED
Threat ID: 6a7b858ebf8831d5395e02be
Added to database: 08/11/2026, 20:26:54 UTC
Last enriched: 08/11/2026, 20:42:14 UTC
Last updated: 09/25/2026, 13:47:47 UTC
Views: 57
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.