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CVE-2026-59563

HMAC Confirmation Token Unbinding in zscaler-mcp-server

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 same type. This issue is fixed in version 0.7.2.

CVSS 3.1 · 4.6 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Zscaler-mcp-server
CVE-2026-25684

File Type Control rule bypass

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.

CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Zia File Type Control
CVE-2026-59569

Android ZCC VPN API method privilege escalation

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

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59570

Android ZCC denial of service

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-25687

ZCC race condition in ZPA tunnel handler

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.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59567

Local privilege escalation

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.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59565

Local and kernel denial-of-service

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.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59568

Remote Code Execution

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.

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59566

Local denial-of-service

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.

CVSS 3.1 · 8.4 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-59564

Authentication bypass between ZCC and client connector portal

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

CVSS 3.1 · 9.1 Critical EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-22568

Unauthorized information retrieval in ZIA Admin UI

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.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Zia Admin Ui Zscaler Internet Access Admin Portal
CVE-2025-54983

Health check port on ZCC allows tunnel bypass

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.

CVSS 3.1 · 5.2 Medium EPSS < 1% KEV · Not listed
Vendors
Microsoft Zscaler
Products
Windows Client Connector
CVE-2025-54982

SAML 2.0 Public Key Validation Issue

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

CVSS 3.1 · 9.6 Critical EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Authentication Server
CVE-2024-31127

MacOS Zscaler Client Connector Local Privilege Escalation

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.

CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2026-22569

Incorrect startup configuration in ZCC

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.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2024-23463

Anti-Tampering bypass via Repair App functionality

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

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2024-23457

Anti-tampering can be disabled with uninstall password enforced

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

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2023-41971

Windows ZCC Upgrade DoS And Privilege Escalation Through RPC Control

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.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector
CVE-2023-28798

Out-of-bounds write to heap in pacparser

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

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Zscaler
Products
Client Connector