ZscalerCVE-2026-59564
Zscaler Client Connector: authentication bypass
Critical9.1CVE-2026-59564 · Published Aug 24, 2026 · updated Aug 28, 2026
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Client Connector Product | < Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 | Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 |
| < MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 | MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 | |
| < iOS: 4.5.1 | iOS: 4.5.1 | |
| < Android: 4.2 | Android: 4.2 |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-304
More Zscaler advisories
All Zscaler| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Sep 14 | Zscaler Client Connector: improper input validation | High7.5 | Android: 4.2.0.152+1 more |
| Sep 14 | Zscaler Client Connector: race condition | High8.1 | 4.6.0.486+3 more |
| Aug 24 | Zscaler Client Connector: privilege escalation | High8.8 | Windows: 4.6.0.457+8 more |
| Aug 24 | Zscaler Client Connector: remote code execution | Critical9.1 | Windows: 4.6.0.457+8 more |
| Aug 24 | Zscaler Client Connector: buffer overflow | High8.8 | Windows: 4.6.0.457+3 more |
| Aug 24 | Zscaler Client Connector: buffer overflow | High8.4 | Android: 4.2+1 more |