Vulnerability details
CVE-2026-59564
Zscaler Client Connector
Authentication bypass between ZCC and client connector portal
CVSS 3.1
9.1Critical
Official description
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (Zscaler) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Zscaler | Client Connector | v < Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372 | CVEProject cvelistV5 (CNA) |
| Zscaler | Client Connector | v < MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191 | CVEProject cvelistV5 (CNA) |
| Zscaler | Client Connector | v < iOS: 4.5.1 | CVEProject cvelistV5 (CNA) |
| Zscaler | Client Connector | v < Android: 4.2 | CVEProject cvelistV5 (CNA) |
| Zscaler | Client Connector | v < ChromeOS: 4.2 | CVEProject cvelistV5 (CNA) |
| Zscaler | Client Connector | v < Linux: 3.7.2.64, 4.2.1.64 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-08-24
- Last updated
- 2026-08-25
- State
- Published
- Assigner (CNA)
- Zscaler
Exploit prediction (EPSS)
0.52%
Probability of exploitation in 30 days
44.9%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-304Missing critical step in authentication