tclahr UAC up to 3.2.0 Placeholder _run_command os command injection

Summaryinfo

A vulnerability, which was classified as critical, has been found in tclahr UAC up to 3.2.0. The affected element is the function _run_command of the component Placeholder Handler. The manipulation leads to os command injection. This vulnerability is listed as CVE-2026-40032. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in tclahr UAC up to 3.2.0. This issue affects the function _run_command of the component Placeholder Handler. The manipulation with an unknown input leads to a os command injection vulnerability. Using CWE to declare the problem leads to CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

UAC (Unix-like Artifacts Collector) before 3.3.0-rc1 contains a command injection vulnerability in the placeholder substitution and command execution pipeline where the _run_command() function passes constructed command strings directly to eval without proper sanitization. Attackers can inject shell metacharacters or command substitutions through attacker-controlled inputs including %line% values from foreach iterators and %user% / %user_home% values derived from system files to achieve arbitrary command execution with the privileges of the UAC process.

The weakness was presented with Mobasi Security Team as 429. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-40032 since 04/08/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

Upgrading to version 3.3.0-rc1 eliminates this vulnerability. Applying the patch 50ace60e172e38feb78347bdf579311c23eff078 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• tclahr

Name

• UAC

Version

• 3.0
• 3.1
• 3.2.0

License

• open-source

Website

• Product: https://github.com/tclahr/uac/

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