Description

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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.1",
  "pubDate": "2026-08-24T14:16:56.210Z",
  "pubdate": "2026-08-24T14:16:56.210Z",
  "executiveSummary": "Multiple vulnerabilities affecting Zscaler Client Connector versions allow remote code execution, enabling unauthenticated and unprivileged adversaries to execute arbitrary code within the execution context of the application. This vulnerability presents a severe risk to endpoint security, as the Zscaler Client Connector typically operates with elevated privileges, potentially leading to complete system compromise, unauthorized access to sensitive internal network resources, and full administrative control over the affected host system. Exploitation requires no prior authentication or administrative privileges on the local machine, lowering the attack barrier for threat actors capable of interacting with vulnerable components of the software. The resulting impact compromises the integrity, confidentiality, and availability of the endpoint, necessitating immediate remediation action by system administrators and security personnel responsible for endpoint protection infrastructure.",
  "technicalDetails": "The identified vulnerabilities in Zscaler Client Connector reside within the application architecture handling client-side processing, inter-process communication, or network listener services. The root cause stems from improper input validation, insecure deserialization, or flawed handling of incoming requests processed by the application's underlying service layer. Because the vulnerable service typically runs with elevated system or administrative privileges to enforce security policies and tunnel traffic, successful exploitation grants the attacker the ability to inherit these high-privilege execution contexts.\nThe attack flow proceeds as follows: An unauthenticated and unprivileged adversary initiates malicious interactions targeting the vulnerable components exposed by Zscaler Client Connector. Depending on the specific vector, this may involve sending crafted payloads via local inter-process communication mechanisms, local TCP/UDP listeners, or protocol handlers processed by the client connector service. Due to inadequate sanitization and trust boundaries within the vulnerable component, the application processes the malicious payload, triggering memory corruption, insecure object instantiation, or arbitrary command execution primitives.\nUpon successful execution of the payload, arbitrary code runs directly within the Zscaler Client Connector context. Post-exploitation impact includes the capability to spawn command shells, manipulate system configurations, inject payloads into other running processes, bypass local security controls enforced by the endpoint agent, and pivot into corporate networks utilizing the established secure tunnels. The lack of authentication and privilege requirements means any local user or network-adjacent attacker, depending on the exposure of the vulnerable interface, can trigger the vulnerability without possessing credentials or prior access to the target application."
}