CVE-2025-64639 identifies a Missing Authorization vulnerability in the WP Compress plugin designed for MainWP, a popular WordPress management tool. The vulnerability arises from incorrectly configured access control security levels, which fail to properly verify whether a user has the necessary permissions to perform certain actions within the plugin. This flaw affects all versions up to and including 6.50.07. Because the authorization checks are missing or insufficient, an attacker—potentially even an unauthenticated user depending on the plugin's exposure—could exploit this to execute unauthorized operations such as modifying plugin settings, accessing sensitive data, or triggering actions that should be restricted. The vulnerability does not currently have a CVSS score and no public exploits have been reported, but the nature of missing authorization typically leads to significant risks. The plugin is used within the MainWP ecosystem, which allows centralized management of multiple WordPress sites, meaning a successful exploit could impact multiple managed sites simultaneously. The vulnerability was reserved in early November 2025 and published in mid-December 2025, indicating recent discovery and disclosure. No official patches or updates are referenced yet, so users must be vigilant. The lack of authentication requirements for exploitation (if applicable) and the broad scope of affected versions increase the threat level. This vulnerability primarily threatens the confidentiality and integrity of managed WordPress environments by enabling unauthorized access and potential manipulation of site content or configurations.

For European organizations, the impact of CVE-2025-64639 could be significant, especially for those relying on MainWP and WP Compress for managing multiple WordPress sites. Unauthorized access could lead to data breaches, defacement, or unauthorized changes to website content and configurations, undermining trust and potentially causing reputational damage. Organizations in sectors such as e-commerce, government, media, and finance that use WordPress extensively may face operational disruptions and compliance risks under GDPR if personal data is exposed. The centralized management nature of MainWP means a single exploit could cascade across multiple sites, amplifying the damage. Additionally, attackers could leverage this vulnerability as a foothold for further lateral movement within the network. The absence of known exploits currently reduces immediate risk, but the vulnerability's characteristics suggest a high potential for exploitation once weaponized. European organizations with limited patch management processes or those unaware of this vulnerability are particularly at risk.

1. Monitor official WP Compress and MainWP channels for patches and apply updates immediately once available. 2. Until patches are released, restrict access to the MainWP dashboard and WP Compress plugin interfaces to trusted administrators only, using network-level controls such as IP whitelisting or VPN access. 3. Implement strict role-based access controls within WordPress and MainWP to limit plugin management capabilities to essential personnel. 4. Enable detailed logging and monitoring of MainWP and WP Compress activities to detect unauthorized or suspicious actions promptly. 5. Conduct regular security audits of WordPress environments managed via MainWP to identify anomalous changes or unauthorized access. 6. Consider temporarily disabling the WP Compress plugin for MainWP if it is not critical to operations until a fix is available. 7. Educate administrators about the risks of missing authorization vulnerabilities and the importance of timely patching and access control. 8. Employ Web Application Firewalls (WAFs) with custom rules to block unauthorized requests targeting the vulnerable plugin endpoints if feasible.