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CVE-2026-59564— Authentication bypass between ZCC and client connector portal

Quick assessment

Affected
Zscaler Client Connector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zscaler Client Connector是美国Zscaler公司的一款实现安全远程访问的网络连接软件。 Zscaler Client Connector存在授权问题漏洞，该漏洞源于两者通信过程中的身份验证绕过问题，可能导致未经授权的访问。

CVSS 9.1 · Critical EPSS 0.53% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Zscaler Client Connector < Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 affected
< MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 affected
< iOS: 4.5.1 affected
< Android: 4.2 affected
< ChromeOS: 4.2 affected
< Linux: 3.7.2.64, 4.2.1.64 affected
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I. Basic Information for CVE-2026-59564

Vulnerability Information
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Vulnerability Title
Authentication bypass between ZCC and client connector portal
Source: CVE Program / CVE List V5
Vulnerability Description
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证中关键步骤缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Zscaler Client Connector 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zscaler Client Connector是美国Zscaler公司的一款实现安全远程访问的网络连接软件。 Zscaler Client Connector存在授权问题漏洞，该漏洞源于两者通信过程中的身份验证绕过问题，可能导致未经授权的访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Zscaler Client Connector 0 ~ Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 -

II. Public POCs for CVE-2026-59564

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III. Intelligence Information for CVE-2026-59564

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Same Patch Batch · Zscaler · 2026-08-24 · 5 CVEs total

CVE-2026-59568 9.1 CRITICAL Remote Code Execution
CVE-2026-59565 8.8 HIGH Local and kernel denial-of-service
CVE-2026-59567 8.8 HIGH Local privilege escalation
CVE-2026-59566 8.4 HIGH Local denial-of-service

IV. Related Vulnerabilities

Same product: Client Connector
Same vendor: Zscaler
Same weakness: CWE-304

V. Comments for CVE-2026-59564

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