Executive Summary

CVE-2026-2364 is a privilege escalation vulnerability in the CODESYS Installer caused by a time-of-check to time-of-use (TOCTOU) race condition. This flaw allows a local attacker with limited privileges to replace the verified downloaded setup file before it is executed during the self-update process or when initiating an installation of the CODESYS Development System.

Because the update process runs with administrator privileges, if a legitimate user confirms the self-update prompt or starts the installation, the attacker can execute malicious code with elevated rights.

This vulnerability affects CODESYS Installer versions prior to 2.6.1.0 and requires user interaction to be exploited.

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Impact Analysis

This vulnerability can allow a low privileged local attacker to gain administrator-level rights on the affected system.

With elevated privileges, the attacker can execute malicious code, potentially compromising the confidentiality, integrity, and availability of the system.

Exploitation requires that a legitimate user confirms the self-update prompt or initiates the installation, but once exploited, it can lead to significant security breaches.

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Compliance Impact

I don't know

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Detection Guidance

I don't know

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Mitigation Strategies

To mitigate the CVE-2026-2364 vulnerability, update the CODESYS Installer to version 2.6.1.0 or later.

Avoid using the self-update mechanism of the CODESYS Installer by manually downloading the fixed installer from the CODESYS Store.

Alternatively, install CODESYS Development System version 3.5.22.0 or newer, which includes the updated installer.

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