CVE-2023-28804: Linux ZCC allows unsigned updates, allowing elevated Code Execution

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-23 · updated 2026-06-17
Weakness: CWE-347

Description

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

Affected products

Zscaler Client Connector: before 1.4.0.105 — fixed in 1.4.0.105

How to fix

Upgrade to a fixed version: Zscaler Client Connector 1.4.0.105. Check the vendor advisory for mitigations.

References

https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023
https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023

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