Client Connector
CVE-2026-59564: Authentication bypass between ZCC and client connector portal
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Published
ExploitedNot in CISA KEV
Ransomware useNot reportedPer CISA
SeverityCRITICALCVSS 3.1 9.1
EPSS0.53%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, MacOS, Linux, iOS, Android) 0 | Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 or later |
| Client Connector (Windows, MacOS, Linux, iOS, Android) 0 | MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 or later |
| Client Connector (Windows, MacOS, Linux, iOS, Android) 0 | iOS: 4.5.1 or later |
| Client Connector (Windows, MacOS, Linux, iOS, Android) 0 | Android: 4.2 or later |
| Client Connector (Windows, MacOS, Linux, iOS, Android) 0 | ChromeOS: 4.2 or later |
| Client Connector (Windows, MacOS, Linux, iOS, Android) 0 | Linux: 3.7.2.64, 4.2.1.64 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.