CVE-2026-59564 Authentication bypass between ZCC and client connector portal
Attackers can bypass authentication between the Zscaler Client Connector and its portal, potentially gaining unauthorized access to client communications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-59564?
CVE-2026-59564 is a critical authentication bypass vulnerability in Zscaler Client Connector, published on 24 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
Weakness: CWE-304
Which versions are affected by CVE-2026-59564?
How do I fix CVE-2026-59564?
No fix has been published for CVE-2026-59564 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-59564 being exploited?
There is no known exploitation of CVE-2026-59564 in the wild and no public exploit code.
Sources
Also known as GHSA-r7wr-wrcm-fj8q.