CVE-2026-59564: Zscaler Client Connector

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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

Published 2026-08-24. Last modified 2026-08-28.