CVE-2026-59564: CWE-304 Missing critical step in authentication in Zscaler Client Connector
Description
CVE-2026-59564 is a critical authentication bypass vulnerability in the communication between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal. This flaw is categorized under CWE-304, indicating a missing critical step in the authentication process. The vulnerability allows unauthenticated attackers to bypass authentication controls, potentially leading to unauthorized access with high confidentiality and integrity impact. No specific affected versions or patch information are provided at this time.
CVSS v3.1
Score 9.1critical
Affected software
Zscaler
Client Connector
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal. This vulnerability is identified as CWE-304, indicating a missing critical step in the authentication process. The CVSS v3.1 base score is 9.1, reflecting a network attack vector with low attack complexity, no privileges required, no user interaction, and high impact on confidentiality and integrity. No vendor advisory or patch information is currently available.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to bypass authentication mechanisms, gaining unauthorized access to the Zscaler Client Connector Portal. This could lead to exposure or modification of sensitive information, compromising confidentiality and integrity. Availability impact is not indicated. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, monitor vendor communications for updates. No specific mitigations or temporary fixes are provided by the vendor at this time.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Zscaler
- Date Reserved
- 2026-07-06T06:18:59.633Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a8c504bacd9273b49a22818
Added to database: 08/24/2026, 14:08:11 UTC
Last enriched: 09/10/2026, 10:37:46 UTC
Last updated: 10/06/2026, 18:48:23 UTC
Views: 107
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