Description

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.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-08-24T14:16:56.080Z",
  "pubdate": "2026-08-24T14:16:56.080Z",
  "executiveSummary": "Multiple vulnerabilities affecting Zscaler Client Connector permit local privilege escalation, enabling an unprivileged local user to execute arbitrary code within a privileged administrative context. This security flaw poses a severe risk to endpoint integrity, as malicious actors capable of establishing initial local access can bypass standard operating system permission boundaries to inherit elevated system privileges. The vulnerability specifically impacts affected versions of Zscaler Client Connector deployed on client endpoints. Successful exploitation requires local execution capabilities on the target host, allowing an attacker to leverage insecure operational behaviors within the software to escalate privileges. The realization of this risk can lead to total compromise of the affected host machine, unauthorized modification of system configurations, deployment of persistent malware, and evasion of endpoint detection mechanisms that rely on standard user context restrictions. Organizations utilizing vulnerable iterations of the product face heightened exposure to lateral movement and persistent endpoint compromise should an unprivileged account be successfully breached by an adversary.",
  "technicalDetails": "The vulnerability resides in affected versions of Zscaler Client Connector, specifically stemming from insecure handling of local operations, process execution flows, or object permissions that govern privileged background services or helper binaries. Root cause analysis of local privilege escalation flaws in endpoint agents typically points toward insecure file system permissions, unquoted service paths, insecure inter-process communication mechanisms, or improper validation of parameters passed to privileged helper executables invoked by unprivileged front-end interfaces.\nThe attack flow begins when an unprivileged local user initiates interaction with the vulnerable components of Zscaler Client Connector. Because the software operates background services running under highly privileged security contexts such as SYSTEM or Administrator, any deficiency in how these components process inputs, instantiate child processes, or manage local resources can be manipulated. An attacker crafts a specialized local payload or leverages predictable execution paths to intercept, substitute, or inject arbitrary commands into the privileged execution stream.\nExploitation does not require network exposure, as the attack surface is strictly local, necessitating prior local access or execution rights on the target operating system. No authentication beyond standard unprivileged local user rights is required to trigger the vulnerable functionality. Upon successful execution of the attack vector, the malicious payload inherits the elevated security token of the targeted privileged process. This results in post-exploitation impact that includes arbitrary code execution with administrative privileges, allowing the attacker to bypass endpoint security controls, manipulate system registry keys, access sensitive credential material stored in memory or disk, and establish persistent system access."
}