Client Connector
CVE-2023-28806: Signature validation error in DLL allows disabling anti-tampering protection
An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityMEDIUMCVSS 3.1 5.7
EPSS0.19%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
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 |
|---|---|
| Client Connector (Windows) 0 | 4.2.0.190 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.