Zscaler vulnerabilities
We track 31 vulnerabilities in Zscaler products across 5 products. 31 are rated high or critical, and none are known to be exploited. The most recent was published on September 14, 2026.
Latest Zscaler vulnerabilities
- 7.5 High severity
On affected versions of Zscaler client connector, a pre-installed peer app can tear down the…
On affected versions of Zscaler client connector, a pre-installed peer app can tear down the Zscaler tunnel, force user logout, and toggle packet capture.
- 8.1 High severity
An improper input validation vulnerability in Zscaler Client Connector on Android and ChromeOS…
An improper input validation vulnerability in Zscaler Client Connector on Android and ChromeOS allows an attacker to potentially bypass Zscaler controls.
- 8.1 High severity
Client Connector: Race Condition within a Thread
A race condition in the ZPA tunnel handler of affected versions of Zscaler Client Connector (ZCC) allows a heap corruption, resulting in a denial of service (client crash) and potentially arbitrary code execution in the context of the ZCC process.
- 9.1 Critical severity
Multiple vulnerabilities on affected versions of Zscaler Client Connector allow remote code…
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.
- 8.8 High severity
Client Connector: Improper Handling of Insufficient Permissions or Privileges
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.
- 8.4 High severity
Client Connector: Improper Handling of Values
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.
- 8.8 High severity
Client Connector: Improper Handling of Values
A remotely exploitable buffer overflow bug can cause a local and kernel denial-of-service attack on affected versions of Zscaler Client Connector on Windows.
- 9.1 Critical severity
Client Connector: Missing Critical Step in Authentication
An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.
- 9.8 Critical severity
Client Connector: Improper Neutralization of Special Elements used in an OS Command
An Improper Input Validation vulnerability in Zscaler Client Connector on MacOS allows OS Command Injection. This issue affects Zscaler Client Connector on MacOS <4.2.
- 7.8 High severity
Client Connector: Improper Verification of Cryptographic Signature
The Zscaler Updater process does not validate the digital signature of the installer before execution, allowing arbitrary code to be locally executed. This affects Zscaler Client Connector on MacOS <4.2.
- 7.8 High severity
Client Connector: Origin Validation Error
While copying individual autoupdater log files, reparse point check was missing which could result into crafted attacks, potentially leading to a local privilege escalation. This issue affects Zscaler Client Connector on Windows <4.2.0.190.
- 7.5 High severity
Client Connector: Improper Verification of Cryptographic Signature
Anti-tampering can be disabled under certain conditions without signature validation. This affects Zscaler Client Connector <4.2.0.190 with anti-tampering enabled.
- 7.6 High severity
DHCP: Missing Authentication for Critical Functionality
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 c
- 7.5 High severity
Client Connector: Improper Validation of Integrity Check Value
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.
- 9.8 Critical severity
Client Connector: Improper Link Resolution Before File Access
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.
- 7.8 High severity
Client Connector: Improper Link Resolution Before File Access
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.
- 7.8 High severity
Client Connector: Improper Validation of Integrity Check Value
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.
- 9.8 Critical severity
Client Connector: Improper Verification of Cryptographic Signature
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.
- 7.8 High severity
Client Connector: Improper Privilege Management
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
- 8.1 High severity
Client Connector: Time-of-check Time-of-use (TOCTOU) Race Condition
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
- 7.8 High severity
The ZScaler service is susceptible to a local privilege escalation vulnerability found in the…
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.
- 7.8 High severity
Client Connector: Improper Limitation of a Pathname to a Restricted Directory
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.
- 7.8 High severity
Client Connector: Improper Handling of Insufficient Permissions or Privileges
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.
- 7.1 High severity
Client Connector: UNIX Symbolic Link (Symlink) Following
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.
- 7.5 High severity
ZIA: Improper Certificate Validation
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.
- 9.8 Critical severity
Client Connector: Improper Neutralization of Special Elements used in an OS Command
An Improper Input Validation vulnerability in Zscaler Client Connector on Linux allows Privilege Escalation. This issue affects Client Connector: before 1.4.0.105
- 7.3 High severity
Client Connector: Improper Link Resolution Before File Access
Zscaler Client Connector for Windows before 4.1 writes/deletes a configuration file inside specific folders on the disk. A malicious user can replace the folder and execute code as a privileged user.
- 7.8 High severity
Client Connector: Improper Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature vulnerability in Zscaler Client Connector on Linux allows Code Injection. This issue affects Zscaler Client Connector for Linux: before 1.3.1.6.
- 7.8 High severity
Client Connector: Origin Validation Error
Origin Validation Error vulnerability in Zscaler Client Connector on Linux allows Inclusion of Code in Existing Process. This issue affects Zscaler Client Connector for Linux: before 1.3.1.6.
- 7.8 High severity
Client Connector: Out-of-bounds Write
Buffer overflow vulnerability in the signelf library used by Zscaler Client Connector on Linux allows Code Injection. This issue affects Zscaler Client Connector for Linux: before 1.3.1.6.
- 9.8 Critical severity
ZIA Admin Portal: Improper Verification of Cryptographic Signature
An Improper Verification of Cryptographic Signature in the SAML authentication of the Zscaler Admin UI allows a Privilege Escalation.This issue affects Admin UI: from 6.2 before 6.2r.