What’s Vulnerable › Vulnerabilities
CVE-2026-59564: Authentication bypass between ZCC and client connector portal
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-24 · updated 2026-10-12
- Weakness: CWE-304
Description
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Affected products
- Zscaler Client Connector: before Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372; before MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191; before iOS: 4.5.1; before Android: 4.2; before ChromeOS: 4.2; before Linux: 3.7.2.64, 4.2.1.64 — fixed in 4.2.1.64, 4.7.0.292, 4.7.0.317, 4.8.0.191, 4.8.0.232, 4.9.0.372
How to fix
Upgrade to a fixed version: Zscaler Client Connector 4.2.1.64, 4.7.0.292, 4.7.0.317, 4.8.0.191. Check the vendor advisory for mitigations.
References
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