CVE-2026-59564: CWE-304 Missing critical step in authentication in Zscaler Client Connector
CVE-2026-59564 is a critical authentication bypass vulnerability in the communication between affected versions of the Zscaler Client Connector and its Portal. This flaw allows an attacker to bypass authentication mechanisms, potentially leading to unauthorized access with high confidentiality and integrity impact. The vulnerability has a CVSS score of 9.1, indicating critical severity. No affected versions or patch information are currently provided, and no known exploits are reported in the wild.
AI Analysis
Technical Summary
This vulnerability, identified as CWE-304 (Missing Critical Step in Authentication), exists in the Zscaler Client Connector product. It allows an attacker to bypass authentication controls in the communication channel between the client connector and the portal. The CVSS 3.1 vector indicates it is remotely exploitable over the network without privileges or user interaction, with high impact on confidentiality and integrity but no impact on availability. The vulnerability is published but lacks vendor-provided remediation details or affected version information.
Potential Impact
Successful exploitation could allow an attacker to gain unauthorized access to the Zscaler Client Connector Portal communications, compromising confidentiality and integrity of data or sessions. There is no indication of availability impact. No active exploitation is currently known.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary mitigation is documented, users should monitor vendor communications for updates. No specific mitigation steps are provided at this time.
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 its Portal. This flaw allows an attacker to bypass authentication mechanisms, potentially leading to unauthorized access with high confidentiality and integrity impact. The vulnerability has a CVSS score of 9.1, indicating critical severity. No affected versions or patch information are currently provided, and no known exploits are reported in the wild.
CVSS v3.1
Score 9.1critical
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-304 (Missing Critical Step in Authentication), exists in the Zscaler Client Connector product. It allows an attacker to bypass authentication controls in the communication channel between the client connector and the portal. The CVSS 3.1 vector indicates it is remotely exploitable over the network without privileges or user interaction, with high impact on confidentiality and integrity but no impact on availability. The vulnerability is published but lacks vendor-provided remediation details or affected version information.
Potential Impact
Successful exploitation could allow an attacker to gain unauthorized access to the Zscaler Client Connector Portal communications, compromising confidentiality and integrity of data or sessions. There is no indication of availability impact. No active exploitation is currently known.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or temporary mitigation is documented, users should monitor vendor communications for updates. No specific mitigation steps are provided 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
- Remediation Level
- null
Threat ID: 6a8c504bacd9273b49a22818
Added to database: 08/24/2026, 14:08:11 UTC
Last enriched: 08/24/2026, 14:22:16 UTC
Last updated: 08/24/2026, 15:09:07 UTC
Views: 20
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