CVE-2025-14166 is a vulnerability classified under CWE-94 (Improper Control of Generation of Code) found in the WPMasterToolKit (WPMTK) WordPress plugin, versions up to and including 2.13.0. The flaw arises because the plugin's Code Snippets feature permits users with Contributor-level or higher privileges to inject and execute arbitrary PHP code without proper capability checks. This means that an attacker who has at least Contributor access to a WordPress site can leverage this feature to run malicious PHP code on the server hosting the site. The consequence of this vulnerability is severe: it enables remote code execution (RCE), which can lead to privilege escalation within the WordPress environment and potentially full compromise of the affected website. The vulnerability is network exploitable without user interaction once the attacker has authenticated access, but it does not require elevated privileges beyond Contributor level. The CVSS 3.1 base score is 5.3, reflecting a medium severity primarily due to the requirement for authenticated access and the lack of direct confidentiality or availability impact. No public exploits have been reported yet, but the vulnerability poses a significant risk given the widespread use of WordPress and the plugin. The lack of patch links suggests that a fix may not yet be publicly available, emphasizing the need for immediate risk mitigation. The vulnerability affects all versions of the plugin, indicating a systemic issue in the plugin's design regarding capability checks for code execution features.

For European organizations, this vulnerability presents a notable risk to websites and web applications running WordPress with the WPMasterToolKit plugin installed. Successful exploitation can lead to unauthorized remote code execution, allowing attackers to execute arbitrary PHP code on the web server. This can result in full site compromise, data manipulation, defacement, or use of the server as a pivot point for further attacks within the organization's network. Given the plugin's popularity among WordPress users, organizations relying on it for site management or functionality could face significant operational disruptions and reputational damage. The medium CVSS score reflects that while the vulnerability requires authenticated access, the ease of exploitation by users with relatively low privileges (Contributor level) increases the threat surface. European organizations in sectors with high web presence, such as e-commerce, media, and government, are particularly vulnerable. Additionally, compromised sites could be leveraged for phishing, malware distribution, or as part of botnets, amplifying the broader security impact within the region.

1. Immediately audit WordPress user roles and restrict Contributor-level or higher access to trusted users only, minimizing the number of users who can exploit this vulnerability. 2. Disable or remove the WPMasterToolKit plugin if it is not essential to reduce the attack surface until a patch is available. 3. Monitor WordPress sites for unusual activity, especially in the Code Snippets feature, and review logs for unauthorized code execution attempts. 4. Implement web application firewalls (WAFs) with custom rules to detect and block suspicious PHP code injection attempts targeting the plugin. 5. Apply principle of least privilege to all WordPress users and enforce strong authentication mechanisms, such as multi-factor authentication, to reduce the risk of compromised accounts. 6. Stay informed about vendor updates and apply patches promptly once released. 7. Conduct regular security assessments and penetration testing focused on WordPress plugins and user privilege configurations. 8. Backup WordPress sites and databases regularly to enable rapid recovery in case of compromise.