9.1

CVE-2026-59568: zscaler client_connector Improper Input Validation

CVSS: 9.1v3.1CriticalAwaiting analysis
Published 24-08-2026Last modified 25-08-2026
Open JSON

Vulnerability summary

CVE-2026-59568 is a critical (CVSS 9.1) Improper Input Validation vulnerability in zscaler client_connector. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.8% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.66%
0%100%
Low · +0.28 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 24-08-2026
    PublishedVulnerability first disclosed.
  2. 25-08-2026
    Last modifiedVulnerability information updated.

Description

Multiple vulnerabilities on affected versions of Zscaler Client Connector allow remote code execution, giving an unauthenticated, unprivileged user the ability to execute arbitrary code in the ZCC context.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.66%

Chance of exploitation in the next 30 days

Percentile

51%

Versus all other CVEs

30-day change

+0.28 pp

From 0.38% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.66%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Zscaler1 product
  • client_connector< 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 | < Linux: 3.7.2.64, 4.2.1.64 | < Android: 4.2 | < ChromeOS: 4.2 | < iOS: 4.5.1

1 vendor · 1 product

References

1 links