Email Security and management
CVE-2026-66154: An insufficient certificate validation in a privileged communication workflow, was identified in a GMS appl…
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.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| GMS (Linux) 9.5 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.