CVE-2026-59564 json
Authentication bypass between ZCC and client connector portal
published 2mo ago modified 30d ago also EUVD-2026-64860
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Patch / fix
- Zscaler Client Connector Android: 4.2, ChromeOS: 4.2, iOS: 4.5.1, Linux: 3.7.2.64, 4.2.1.64, MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191, Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2mo ago
Exploit prediction
0.53% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
- Zscaler Client Connector
Classification
- Weakness
-
- CWE-304 Missing Critical Step in Authentication
References
Sources
- CVE List CVE-2026-59564
- NVD CVE-2026-59564
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