A locally exploitable buffer overflow bug can cause a local denial-of-service attack on affected versions of Zscaler Client Connector on Android and ChromeOS.

Multiple vulnerabilities on affected versions of Zscaler Client Connector allow local privilege escalation, giving an unprivileged user the ability to execute arbitrary code in a privileged context.

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.

An incorrect startup configuration of affected versions of Zscaler Client Connector on Windows may cause a limited amount of traffic from being inspected under rare circumstances.

CVE-2026-40955 is an integer underflow vulnerability in the traffic parsing function of Secure Access clients prior to 14.55. Attackers with intimate knowledge of and total control over the tunnel protocol can create a non-persistent DoS against their client.

Anti-tampering protection of the Zscaler Client Connector can be bypassed under certain conditions when running the Repair App functionality. This affects Zscaler Client Connector on Windows prior to 4.2.1

The anti-tampering functionality of the Zscaler Client Connector can be disabled under certain conditions when an uninstall password is enforced. This affects Zscaler Client Connector on Windows prior to 4.2.0.209

An Improper Link Resolution Before File Access ('Link Following') vulnerability in Zscaler Client Connector on Windows allows a system file to be overwritten.This issue affects Client Connector on Windows: before 3.7.

An improper verification of cryptographic signature in Zscaler's SAML authentication mechanism on the server-side allowed an authentication abuse.

Improper validation of user-supplied input in the ZIA Admin UI could allow an authenticated administrator to initiate backend functions through specific input fields in limited scenarios.

Improper neutralization of special elements in user-supplied input within the ZIA Admin UI could allow an authenticated administrator to access or retrieve unauthorized internal information in rare conditions.

An out-of-bounds write to heap in the pacparser library on Zscaler Client Connector on Mac may lead to arbitrary code execution.

An Improper Validation of Integrity Check Value vulnerability in Zscaler Client Connector on Windows during the Repair App functionality may allow Local Execution of Code.This issue affects Client Connector on Windows: before 4.1.0.62.

A fallback mechanism in code sign checking on macOS may allow arbitrary code execution. This issue affects Zscaler Client Connector on MacOS prior to 4.2.

An Improper Validation of Integrity Check Value vulnerability in Zscaler Client Connector on MacOS allows a denial of service of the Client Connector binary and thus removing client functionality.This issue affects Client Connector on MacOS: before 3.4.

An Improper Link Resolution Before File Access ('Link Following') vulnerability in Zscaler Client Connector on Mac allows a system file to be overwritten.This issue affects Zscaler Client Connector on Mac : before 3.7.

An Improper Validation of Integrity Check Value vulnerability in Zscaler Client Connector on MacOS during the upgrade process may allow a Local Execution of Code.This issue affects Client Connector on MacOS: before 3.4.

An Improper Validation of Integrity Check Value in Zscaler Client Connector on Windows allows an authenticated user to disable ZIA/ZPA by interrupting the service restart from Zscaler Diagnostics. This issue affects Client Connector: before 4.2.0.149.

A health check port on Zscaler Client Connector on Windows, versions 4.6 < 4.6.0.216 and 4.7 < 4.7.0.47, which under specific circumstances was not released after use, allowed traffic to potentially bypass ZCC forwarding controls.

An arbitrary file deletion in ZSATrayManager where it protects the temporary encrypted ZApp issue reporting file from the unprivileged end user access and modification. Fixed version: Win ZApp 4.3.0 and later.

In some rare cases, there is a password type validation missing in Revert Password check and for some features it could be disabled. Fixed Version: Win ZApp 4.3.0.121 and later.

ZSATray passes the previousInstallerName as a config parameter to TrayManager, and TrayManager constructs the path and appends previousInstallerName to get the full path of the exe. Fixed Version: Win ZApp 4.3.0.121 and later.

The ZScaler service is susceptible to a local privilege escalation vulnerability found in the ZScalerService process. Fixed Version: Mac ZApp 4.2.0.241 and later.

DHCP can add routes to a client’s routing table via the classless static route option (121). VPN-based security solutions that rely on routes to redirect traffic can be forced to leak traffic over the physical interface. An attacker on the same local network can read, disrupt, or possibly modify network traffic that was expected to be protected by the VPN.

In Zscaler Internet Access (ZIA) a mismatch between Connect Host and Client Hello's Server Name Indication (SNI) enables attackers to evade network security controls by hiding their communications within legitimate traffic.

An improper verification of a loaded library in Zscaler Client Connector on Mac < 4.2.0.241 may allow a local attacker to elevate their privileges.

The Zscaler Client Connector Installer and Unsintallers for Windows prior to 3.6 had an unquoted search path vulnerability. A local adversary may be able to execute code with SYSTEM privileges.