CVE-2024-53806 identifies a missing authorization vulnerability in the yonifre Maspik – Spam blacklist plugin, specifically in its contact-forms-anti-spam component. The vulnerability arises from incorrectly configured access control security levels, which fail to properly restrict unauthorized users from performing certain actions within the plugin. This misconfiguration can allow attackers to bypass authorization checks and potentially manipulate the spam blacklist or related settings. The affected versions include all releases up to and including 2.2.7. The plugin is commonly used in WordPress environments to prevent spam submissions through contact forms by maintaining a blacklist of spam sources. The lack of proper authorization controls means that an attacker with access to the plugin interface could alter blacklist entries, disable protections, or otherwise compromise the spam filtering mechanism. Although no public exploits have been reported yet, the vulnerability represents a significant risk because it undermines the integrity of spam defenses and could facilitate increased spam or malicious form submissions. The vulnerability does not require user interaction but does require the attacker to reach the vulnerable plugin’s interface, which may be exposed depending on site configuration. No CVSS score has been assigned yet, and no patches have been published at the time of this report. The vulnerability was reserved on November 22, 2024, and published on December 6, 2024.

The primary impact of CVE-2024-53806 is on the integrity and availability of spam filtering mechanisms in affected WordPress sites using the Maspik – Spam blacklist plugin. Unauthorized modification of the spam blacklist can lead to increased spam submissions, potentially overwhelming contact forms and degrading user experience. This can also facilitate phishing or malware distribution through unchecked form submissions. Organizations relying on this plugin for spam mitigation may face operational disruptions and reputational damage if spam floods their communication channels. Additionally, attackers could exploit the vulnerability to disable or weaken anti-spam protections, indirectly enabling further attacks such as social engineering or injection of malicious payloads via contact forms. The vulnerability does not directly expose sensitive data but compromises the security posture of the affected application layer. Given the widespread use of WordPress and the popularity of contact form plugins, the scope of affected systems could be significant, especially for organizations with high web traffic and customer interaction through forms.

To mitigate CVE-2024-53806, organizations should first monitor for the release of official patches or updates from the yonifre Maspik plugin developers and apply them promptly. Until patches are available, restrict access to the WordPress admin dashboard and plugin management interfaces using strong authentication methods and role-based access controls to prevent unauthorized users from interacting with the plugin. Implement web application firewalls (WAFs) to detect and block suspicious requests targeting the plugin’s endpoints. Regularly audit user permissions to ensure only trusted administrators have the ability to modify plugin settings. Additionally, monitor logs and alerts for unusual changes to spam blacklist entries or spikes in spam submissions through contact forms. Consider temporarily disabling the plugin if the risk is deemed high and no immediate patch is available. Educate site administrators on the importance of plugin security and encourage timely updates to reduce exposure to similar vulnerabilities.