CVE-2025-58600 is a Missing Authorization vulnerability (CWE-862) identified in the Cozmoslabs Paid Member Subscriptions plugin, affecting versions up to 2.15.9. This vulnerability arises due to improperly configured access control mechanisms, allowing unauthorized users to perform actions or access resources that should be restricted. Specifically, the flaw is in the authorization logic, meaning that the system fails to verify whether a user has the necessary permissions before granting access to certain functionalities or data. The CVSS 3.1 base score of 5.3 (medium severity) reflects that the vulnerability can be exploited remotely (AV:N), requires no privileges (PR:N), and no user interaction (UI:N), but impacts only availability (A:L) with no confidentiality or integrity impact. The scope remains unchanged (S:U), indicating the vulnerability affects only the vulnerable component. Although no known exploits are currently reported in the wild, the vulnerability could allow attackers to disrupt service availability or cause denial of service conditions by exploiting the missing authorization checks. Since the Paid Member Subscriptions plugin is used for managing membership access and subscriptions on WordPress sites, unauthorized access could lead to service disruptions or manipulation of subscription states, potentially affecting business operations relying on membership management.

For European organizations utilizing the Cozmoslabs Paid Member Subscriptions plugin, this vulnerability could lead to service availability issues, disrupting membership management workflows. Organizations relying on this plugin for subscription-based services may experience denial of service or operational interruptions if attackers exploit the missing authorization to interfere with subscription processes. Although confidentiality and integrity are not directly impacted, availability disruptions can affect customer trust, revenue streams, and operational continuity. Given the plugin’s role in managing paid memberships, any downtime or service degradation could have financial and reputational consequences. Furthermore, organizations in sectors with strict service availability requirements, such as e-commerce, education, or digital media, may face compliance challenges if service disruptions occur. The fact that exploitation requires no privileges or user interaction increases the risk profile, as attackers can attempt exploitation remotely without authentication.

To mitigate this vulnerability, European organizations should promptly update the Paid Member Subscriptions plugin to a patched version once released by Cozmoslabs. Until a patch is available, administrators should implement strict access control policies at the web server or application firewall level to restrict access to sensitive plugin endpoints. Conduct a thorough review of membership and subscription management workflows to identify any exposed functionalities that could be exploited due to missing authorization. Employ monitoring and logging to detect unusual access patterns or attempts to access restricted areas of the plugin. Additionally, consider isolating the membership management system within a segmented network zone to limit potential impact. Organizations should also engage with Cozmoslabs support or security advisories to obtain timely updates and guidance. Finally, implement a robust incident response plan to quickly address any exploitation attempts and minimize downtime.