CVE-2025-49906 identifies a missing authorization vulnerability in the StellarWP WPComplete plugin for WordPress, affecting all versions up to and including 2.9.5.3. The vulnerability arises because certain plugin functions are accessible without proper enforcement of access control lists (ACLs), allowing unauthorized users to invoke functionality that should be restricted. This can lead to unauthorized access or modification of course completion data or other plugin-managed content. The issue does not require authentication or user interaction, increasing the risk of exploitation. Although no public exploits have been reported, the vulnerability's nature suggests attackers could leverage it to manipulate plugin data or disrupt service integrity. WPComplete is widely used in WordPress-based e-learning and content management sites, making this vulnerability relevant for organizations relying on these platforms. The absence of a CVSS score indicates the need for an independent severity assessment based on the vulnerability's characteristics. The vulnerability was reserved in June 2025 and published in October 2025, with no patch links currently available, emphasizing the need for vigilance and proactive mitigation.

For European organizations, this vulnerability poses a significant risk to the confidentiality and integrity of data managed by WPComplete, particularly in educational institutions, training providers, and enterprises using WordPress for course management. Unauthorized access could allow attackers to alter course completion statuses, potentially undermining certification processes or compliance tracking. The integrity of user progress data could be compromised, leading to reputational damage and operational disruption. Additionally, unauthorized access might be leveraged as a foothold for further attacks within the WordPress environment. Given the widespread use of WordPress and WPComplete in Europe, especially in countries with strong e-learning sectors, the impact could be broad. Organizations handling sensitive training data or compliance records are particularly vulnerable. The lack of authentication requirements for exploitation increases the threat level, making it easier for attackers to target vulnerable sites remotely.

Organizations should immediately inventory their WordPress installations to identify the presence of the WPComplete plugin and its version. Until an official patch is released by StellarWP, administrators should restrict access to WPComplete functionality by implementing strict role-based access controls and limiting plugin usage to trusted users only. Monitoring and logging plugin activity can help detect suspicious access attempts. Employing Web Application Firewalls (WAFs) with custom rules to block unauthorized requests targeting WPComplete endpoints may reduce exposure. Regular backups of WordPress sites and databases are essential to enable recovery in case of compromise. Organizations should subscribe to vendor advisories and apply patches promptly once available. Additionally, conducting security audits of WordPress plugins and minimizing the number of installed plugins can reduce attack surface. Educating site administrators about the risks of unauthorized access and encouraging prompt updates will further enhance security posture.