CVE-2026-59564 — CRITICAL (9.1)

Vulnerability Description

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

CVSS Score

9.1

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

NONE

Related Weaknesses (CWE)

CWE-304

References

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

FAQ

What is CVE-2026-59564?

CVE-2026-59564 is a vulnerability with a CVSS score of 9.1 (CRITICAL). An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.

How severe is CVE-2026-59564?

CVE-2026-59564 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-59564?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.