Traffic Inspection Bypass via Client Connector Misconfiguration

CVE-2026-22569 March 31, 2026

Now this one is sneaky. CVE-2026-22569 involves a startup configuration issue in Zscaler Client Connector for Windows that could allow traffic to bypass inspection under rare conditions.

Think about that for a second. The entire point of using Zscaler is to inspect and secure traffic. If there’s a window where traffic slips through uninspected, even briefly, that’s a potential blind spot attackers love.

The issue happens during startup. The client may not fully apply inspection policies before allowing traffic to flow. It’s like a security guard showing up late to their shift while people are already walking in.

This vulnerability doesn’t guarantee exploitation, but it creates an opportunity window. And in cybersecurity, even milliseconds can matter depending on the attack.

Remediation is straightforward. Ensure all endpoints are running updated versions of the Client Connector where the startup logic has been fixed. Zscaler provides release summaries and upgrade guidance here:
https://help.zscaler.com/zscaler-client-connector

Also, consider enforcing network-level controls that don’t rely solely on endpoint agents. Defense in depth is not just a buzzword. It’s your safety net when something like this happens.

From a best practices perspective, ensure endpoints are patched promptly and monitored during startup events. Endpoint detection and response tools can help identify suspicious traffic during system initialization.

For end users, this means one thing. Don’t delay reboot-required updates. That “Remind me later” button is sometimes more dangerous than you think.