CVE-2026-59564 PUBLISHED

Authentication bypass between ZCC and client connector portal

Assigner: Zscaler
Reserved: 06.07.2026 Published: 24.08.2026 Updated: 24.08.2026

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

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Zscaler
Product	Client Connector
Versions	Default: affected affected from 0 to Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 (excl.) affected from 0 to MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 (excl.) affected from 0 to iOS: 4.5.1 (excl.) affected from 0 to Android: 4.2 (excl.) affected from 0 to ChromeOS: 4.2 (excl.) affected from 0 to Linux: 3.7.2.64, 4.2.1.64 (excl.)

References

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

Problem Types

CWE-304 Missing critical step in authentication CWE

Impacts

CAPEC-115 Authentication Bypass