CVE-2026-59564

Authentication bypass between ZCC and client connector portal

State: Published
Severity: 9.1 Critical
Published: Aug 24, 2026
Updated: Aug 25, 2026
Reserved: Jul 6, 2026

Description

An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	Zscaler

Weaknesses

CWE-304 Missing critical step in authentication

Affected Products

Product	Versions
Client ConnectorZscaler	before Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372Affected before MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191Affected before iOS: 4.5.1Affected before Android: 4.2Affected before ChromeOS: 4.2Affected before Linux: 3.7.2.64, 4.2.1.64Affected

References

https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2026

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.