tclahr UAC up to 3.2.x User Substitution Logic parse_artifact.sh eval username/home command injection

Summaryinfo

A vulnerability classified as problematic has been found in tclahr UAC up to 3.2.x. This vulnerability affects the function eval of the file parse_artifact.sh of the component User Substitution Logic. Performing a manipulation of the argument username/home results in command injection. This vulnerability is known as CVE-2026-41451. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in tclahr UAC up to 3.2.x. This affects the function eval of the file parse_artifact.sh of the component User Substitution Logic. The manipulation of the argument username/home with an unknown input leads to a command injection vulnerability. CWE is classifying the issue as CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

UAC (Unix-like Artifacts Collector) versions prior to 3.3.0 contain a command injection vulnerability in the user substitution logic within parse_artifact.sh where usernames and home directories from /etc/passwd are substituted directly into command strings without escaping before execution via eval. Attackers can inject shell metacharacters such as command substitution syntax or semicolons through crafted usernames or home directory paths in /etc/passwd entries to execute arbitrary commands on the analyst's host system.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-41451 since 04/20/2026. The exploitability is told to be easy. Attacking locally is a requirement. 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 eliminates this vulnerability.

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Productinfo

Vendor

• tclahr

Name

• UAC

Version

• 3.0
• 3.1
• 3.2

Website

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

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