[NEW] [high] ZScaler Client Connector: Multiple Vulnerabilities

highCVE-2026-59564 CVE-2026-59565 CVE-2026-59566 CVE-2026-59567 CVE-2026-59568

An attacker can exploit multiple vulnerabilities in ZScaler Client Connector to bypass security measures, execute arbitrary code, gain elevated privileges, or trigger a denial of service condition.

CSIRTS triage

vendor: ZScaler product: ZScaler Client Connector Authentication bypass Remote code execution Privilege escalation Denial of service

What: Multiple vulnerabilities in ZScaler Client Connector allow attackers to bypass security measures, execute arbitrary code, gain elevated privileges, and trigger denial of service.
Who is affected: All deployments of ZScaler Client Connector are at risk; remote code execution and privilege escalation are possible.
Urgency: Critical; remote code execution and privilege escalation combined with security bypass require immediate patching.
Action: Update ZScaler Client Connector to the latest patched version on all endpoints immediately.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch ZScaler Client Connector

Get an email when a new ZScaler Client Connector advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-25
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2998

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-595640.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-595650.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-595660.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-595670.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-595680.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-59564	coverage & exploitation status	NVD · CVE.org
CVE-2026-59565	coverage & exploitation status	NVD · CVE.org
CVE-2026-59566	coverage & exploitation status	NVD · CVE.org
CVE-2026-59567	coverage & exploitation status	NVD · CVE.org
CVE-2026-59568	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for ZScaler Client Connector

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-59568: Multiple vulnerabilities on affected versions of Zscaler Client Connector allow remote code ex…nvd · 2026-08-24
highCVE-2026-59567: Multiple vulnerabilities on affected versions of Zscaler Client Connector allow local privileg…nvd · 2026-08-24
highCVE-2026-59566: A locally exploitable buffer overflow bug can cause a local denial-of-service attack on affect…nvd · 2026-08-24
highCVE-2026-59565: A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service atta…nvd · 2026-08-24
criticalCVE-2026-59564: An authentication bypass issue exists in communications between affected versions of the Zscal…nvd · 2026-08-24