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CVE-2026-59564

Authentication bypass between ZCC and client connector portal

Critical9.1EPSS 0.53%
Published
Updated
Reserved
Assigned by
Zscaler

Description

An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.

Scores

CVSS scores of CVE-2026-59564, by who scored it
Scored byCVSSScoreVector
ZscalerCNA (assigner)3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Awaiting Analysis3.1Critical9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.53% · top 55% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.

Weakness

Affected products

  • Zscaler · Client Connector

    • affected < Windows: 4.6.0.457, 4.7.0.317, 4.8.0.232, 4.9.0.372
    • affected < MacOS: 4.5.2.312, 4.7.0.292, 4.8.0.191
    • affected < iOS: 4.5.1
    • affected < Android: 4.2
    • affected < ChromeOS: 4.2
    • affected < Linux: 3.7.2.64, 4.2.1.64

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

CVE-2026-59564 badge
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Record last updated .