CVE-2025-11887 is a vulnerability classified under CWE-862 (Missing Authorization) found in the Supervisor plugin for WordPress, developed by tiagohillebrandt. The flaw exists because several AJAX functions within the plugin lack proper capability checks, allowing users with Subscriber-level access or higher to perform unauthorized modifications to plugin settings. Since WordPress roles such as Subscriber are typically assigned to authenticated users with minimal privileges, this vulnerability effectively elevates their ability to alter plugin configurations without administrative consent. The vulnerability affects all versions up to and including 1.3.2 of the Supervisor plugin. The CVSS v3.1 base score is 4.3, indicating a medium severity level, with an attack vector of network (remote), low attack complexity, requiring privileges (authenticated users), no user interaction, and impacting only integrity without affecting confidentiality or availability. No patches or exploit code are currently publicly available, and no known exploits have been reported in the wild. The missing authorization checks on AJAX endpoints mean that an attacker who can authenticate as a Subscriber can send crafted requests to update plugin settings, potentially altering plugin behavior or enabling further attack vectors if combined with other vulnerabilities or misconfigurations. This vulnerability highlights the importance of proper capability checks in WordPress plugin development, especially for AJAX handlers that can be invoked remotely. Organizations using the Supervisor plugin should monitor for updates from the vendor and consider interim mitigations such as restricting Subscriber role capabilities or disabling the plugin if not essential.

For European organizations, this vulnerability poses a risk primarily to the integrity of WordPress plugin configurations. Unauthorized modification of plugin settings could lead to altered functionality, potential privilege escalation if combined with other vulnerabilities, or disruption of site operations. While it does not directly compromise confidentiality or availability, the integrity impact could indirectly facilitate further attacks or data exposure. Organizations relying on WordPress sites with the Supervisor plugin installed, especially those allowing Subscriber-level user registrations (e.g., community sites, membership platforms), are at higher risk. The vulnerability could be exploited by malicious insiders or compromised low-privilege accounts to manipulate site behavior. This may affect trustworthiness of the website, compliance with data protection regulations if site integrity is compromised, and could lead to reputational damage. Given the widespread use of WordPress across Europe, the impact could be significant in sectors such as media, education, and e-commerce where WordPress is prevalent. However, the medium severity and requirement for authenticated access somewhat limit the scope of impact compared to more critical vulnerabilities.

1. Immediately review and restrict Subscriber role capabilities to the minimum necessary, potentially disabling AJAX access if feasible. 2. Monitor WordPress logs and plugin settings change history for unusual or unauthorized modifications. 3. If the Supervisor plugin is not essential, consider disabling or uninstalling it until a patch is released. 4. Implement Web Application Firewall (WAF) rules to detect and block suspicious AJAX requests targeting the Supervisor plugin endpoints. 5. Educate site administrators to audit user roles and permissions regularly, especially for sites allowing user registrations. 6. Follow closely for official patches or updates from the plugin vendor and apply them promptly once available. 7. Consider deploying additional security plugins that enforce stricter capability checks or provide enhanced logging and alerting for configuration changes. 8. Conduct periodic security assessments of WordPress installations to identify and remediate similar authorization issues proactively.