WatchYourLAN Configuration Page argument injection

Summaryinfo

A vulnerability described as critical has been identified in WatchYourLAN. Affected by this issue is some unknown functionality of the component Configuration Page. Such manipulation leads to argument injection. This vulnerability is uniquely identified as CVE-2026-0774. The attack can only be initiated within the local network. No exploit exists.

Detailsinfo

A vulnerability was found in WatchYourLAN (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component Configuration Page. The manipulation with an unknown input leads to a argument injection vulnerability. Using CWE to declare the problem leads to CWE-88. The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string. Impacted is confidentiality, integrity, and availability. CVE summarizes:

WatchYourLAN Configuration Page Argument Injection Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of WatchYourLAN. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the arpstrs parameter. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-26708.

The advisory is shared for download at zerodayinitiative.com. This vulnerability is handled as CVE-2026-0774. The exploitation is known to be easy. Access to the local network is required for this attack. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/25/2026). The MITRE ATT&CK project declares the attack technique as T1059.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• WatchYourLAN

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