Zscaler, Inc. — recent CVEs

CVE-2026-59563 · 4.6 MEDIUM — HMAC Confirmation Token Unbinding in zscaler-mcp-server

Mon, 28 Sep 2026 12:54:52 GMT

Zscaler MCP Server versions 0.7.0 and 0.7.1 has an issue where HMAC confirmation tokens were not bound to the target resource identifier, allowing an MCP client or agent to replay a token generated for one resource to affect another resource of the s…

CVE-2026-25684 · 4.4 MEDIUM — File Type Control rule bypass

Fri, 18 Sep 2026 14:01:10 GMT

A file type attribution issue in Zscaler Internet Access File Type Control evaluation rules may allow improper evaluation of File Type Control policies in rare circumstances.

CVE-2026-59570 · 7.5 HIGH — Android ZCC denial of service

Mon, 14 Sep 2026 14:47:13 GMT

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.

CVE-2026-59569 · 8.1 HIGH — Android ZCC VPN API method privilege escalation

Mon, 14 Sep 2026 14:42:34 GMT

An improper input validation vulnerability in Zscaler Client Connector on Android and ChromeOS allows an attacker to potentially bypass Zscaler controls.

CVE-2026-25687 · 8.1 HIGH 🌩️ — ZCC race condition in ZPA tunnel handler

Mon, 14 Sep 2026 14:37:04 GMT

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.

CVE-2026-59568 · 9.1 CRITICAL 🌩️ — Remote Code Execution

Mon, 24 Aug 2026 13:44:21 GMT

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.

CVE-2026-59567 · 8.8 HIGH — Local privilege escalation

Mon, 24 Aug 2026 13:41:38 GMT

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.

CVE-2026-59566 · 8.4 HIGH — Local denial-of-service

Mon, 24 Aug 2026 13:41:04 GMT

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.

CVE-2026-59565 · 8.8 HIGH — Local and kernel denial-of-service

Mon, 24 Aug 2026 13:40:23 GMT

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.

CVE-2026-59564 · 9.1 CRITICAL 🌩️ — Authentication bypass between ZCC and client connector portal

Mon, 24 Aug 2026 13:39:16 GMT

An authentication bypass issue exists in communications between affected versions of the Zscaler Client Connector and the Zscaler Client Connector Portal.

CVE-2026-22569 · 5.4 MEDIUM 🌩️ — Incorrect startup configuration in ZCC

Tue, 31 Mar 2026 14:54:57 GMT

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-2026-22567 · 7.6 HIGH — ZIA Admin UI Input Validation Bug

Mon, 23 Feb 2026 16:13:32 GMT

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.

CVE-2026-22568 · 5.5 MEDIUM — Unauthorized information retrieval in ZIA Admin UI

Mon, 23 Feb 2026 16:12:52 GMT

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.

CVE-2025-54983 · 5.2 MEDIUM — Health check port on ZCC allows tunnel bypass

Wed, 12 Nov 2025 03:07:39 GMT

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.

CVE-2025-54982 · 9.6 CRITICAL — SAML 2.0 Public Key Validation Issue

Tue, 05 Aug 2025 05:36:06 GMT

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

CVE-2024-31127 · 7.3 HIGH — MacOS Zscaler Client Connector Local Privilege Escalation

Wed, 04 Jun 2025 04:45:07 GMT

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.

CVE-2023-28806 · 5.7 MEDIUM — Signature validation error in DLL allows disabling anti-tampering protection

Tue, 06 Aug 2024 15:41:01 GMT

An Improper Validation of signature in Zscaler Client Connector on Windows allows an authenticated user to disable anti-tampering. This issue affects Client Connector on Windows <4.2.0.190.

CVE-2024-23483 · 7 HIGH — Local Privilege Escalation via lack of input validation

Tue, 06 Aug 2024 15:30:51 GMT

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.

CVE-2024-23460 · 6.4 MEDIUM — Incorrect signature validation of package

Tue, 06 Aug 2024 15:29:26 GMT

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.

CVE-2024-23464 · 7.2 HIGH — Zscaler bypass with administrative privileges on Windows

Tue, 06 Aug 2024 15:24:03 GMT

In certain cases, Zscaler Internet Access (ZIA) can be disabled by PowerShell commands with admin rights. This affects Zscaler Client Connector on Windows <4.2.1

CVE-2024-23458 · 7.3 HIGH — Local Privilege Escalation on Zscaler Client Connector on Windows

Tue, 06 Aug 2024 15:22:58 GMT

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.

CVE-2024-23456 · 7.8 HIGH — Signature validation issue leads to Anti-Tampering bypass

Tue, 06 Aug 2024 15:21:51 GMT

Anti-tampering can be disabled under certain conditions without signature validation. This affects Zscaler Client Connector <4.2.0.190 with anti-tampering enabled.

CVE-2024-23462 · 3.3 LOW — ZCC Mac validinstaller file integrity check missing

Thu, 02 May 2024 13:11:38 GMT

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…

CVE-2024-23461 · 4.2 MEDIUM — ZCC macOS Upgrade ZIP Bomb DoS

Thu, 02 May 2024 13:11:29 GMT

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.

CVE-2024-23459 · 7.1 HIGH — Multiple Arbitrary Creates/Overwrites by link following

Thu, 02 May 2024 13:11:19 GMT

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.

CVE-2023-41971 · 5.3 MEDIUM — Windows ZCC Upgrade DoS And Privilege Escalation Through RPC Control

Thu, 02 May 2024 13:11:07 GMT

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.

CVE-2023-41970 · 6 MEDIUM — Repair App local code execution with arbitrary privileges

Thu, 02 May 2024 13:10:51 GMT

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.

CVE-2023-28798 · 6.5 MEDIUM 🌩️ — Out-of-bounds write to heap in pacparser

Thu, 02 May 2024 13:10:31 GMT

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

CVE-2024-23480 · 7.5 HIGH — Insecure MacOS code sign check fallback

Wed, 01 May 2024 16:27:35 GMT

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.

CVE-2024-23457 · 7.8 HIGH — Anti-tampering can be disabled with uninstall password enforced

Wed, 01 May 2024 16:26:11 GMT

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

CVE-2024-23463 · 8.8 HIGH — Anti-Tampering bypass via Repair App functionality

Tue, 30 Apr 2024 16:17:53 GMT

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

CVE-2024-23482 · 7 HIGH — ZScalerService Local Privilege Escalation

Tue, 26 Mar 2024 14:23:20 GMT

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.

CVE-2023-41973 · 7.3 HIGH — Lack of input santization on Zscaler Client Connector enables arbitrary code execution

Tue, 26 Mar 2024 14:19:13 GMT

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.

CVE-2023-41972 · 7.3 HIGH — Revert password check incorrect type validation

Tue, 26 Mar 2024 14:16:24 GMT

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.

CVE-2023-41969 · 7.3 HIGH — ZSATrayManager Arbitrary File Deletion

Tue, 26 Mar 2024 14:14:21 GMT

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.

CVE-2023-28807 · 5.1 MEDIUM — Bypass of ZIA domain fronting detection module through evasion technique

Wed, 31 Jan 2024 19:16:59 GMT

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.

CVE-2023-28802 · 4.9 MEDIUM — Disable Zscaler using machine tunnel restart

Tue, 21 Nov 2023 10:51:50 GMT

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…

CVE-2023-28794 · 4.3 MEDIUM 🌩️ — PAC Files Exposed to Internet Websites

Mon, 06 Nov 2023 07:19:25 GMT

Origin Validation Error vulnerability in Zscaler Client Connector on Linux allows Privilege Abuse. This issue affects Zscaler Client Connector for Linux: before 1.3.1.6.

CVE-2023-28805 · 6.7 MEDIUM — ZCC on Linux privilege escalation

Mon, 23 Oct 2023 13:33:57 GMT

An Improper Input Validation vulnerability in Zscaler Client Connector on Linux allows Privilege Escalation. This issue affects Client Connector: before 1.4.0.105

CVE-2023-28804 · 8.2 HIGH 🌩️ — Linux ZCC allows unsigned updates, allowing elevated Code Execution

Mon, 23 Oct 2023 13:33:19 GMT

An Improper Verification of Cryptographic Signature vulnerability in Zscaler Client Connector on Linux allows replacing binaries.This issue affects Linux Client Connector: before 1.4.0.105

CVE-2023-28803 · 5.9 MEDIUM — Traffic being bypassed by ZCC by configuring synthetic IP range as local network

Mon, 23 Oct 2023 13:32:17 GMT

An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.

CVE-2023-28797 · 6.3 MEDIUM — LPE using arbitrary file delete with Symlinks

Mon, 23 Oct 2023 13:30:38 GMT

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.

CVE-2023-28796 · 7.1 HIGH — IPC Bypass Through PLT Section in ELF

Mon, 23 Oct 2023 13:28:15 GMT

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.

CVE-2023-28795 · 7.8 HIGH — Client IPC validation bypass

Mon, 23 Oct 2023 13:27:24 GMT

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.

CVE-2023-28793 · 7.8 HIGH — Heap Based Buffer Overflow in Library

Mon, 23 Oct 2023 13:26:08 GMT

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.

CVE-2021-26738 · 7.8 HIGH — Privilege Escalation for ZCC macOS via PATH Variable

Mon, 23 Oct 2023 13:24:49 GMT

Zscaler Client Connector for macOS prior to 3.7 had an unquoted search path vulnerability via the PATH variable. A local adversary may be able to execute code with root privileges.

CVE-2021-26737 · 5.5 MEDIUM — Privilege Escalation Using PID Reuse in ZCC macOS

Mon, 23 Oct 2023 13:22:51 GMT

The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.

CVE-2021-26736 · 6.7 MEDIUM — ZApp Installer Privilege Escalation Vulnerabilities

Mon, 23 Oct 2023 13:21:12 GMT

Multiple vulnerabilities in the Zscaler Client Connector Installer and Uninstaller for Windows prior to 3.6 allowed execution of binaries from a low privileged path. A local adversary may be able to execute code with SYSTEM privileges.

CVE-2021-26735 · 6.7 MEDIUM — Untrusted Search Path While Executing REG DELETE by Uninstaller

Mon, 23 Oct 2023 13:19:35 GMT

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.

CVE-2021-26734 · 4.4 MEDIUM — Junction Delete leading to elevation of privilege

Mon, 23 Oct 2023 13:18:36 GMT

Zscaler Client Connector Installer on Windows before version 3.4.0.124 improperly handled directory junctions during uninstallation. A local adversary may be able to delete folders in an elevated context.