CVE-2025-11887 is a vulnerability identified in the Supervisor plugin for WordPress, developed by tiagohillebrandt. The issue arises from a missing authorization check (CWE-862) on several AJAX functions within the plugin, present in all versions up to and including 1.3.2. This flaw allows any authenticated user with at least Subscriber-level privileges to modify plugin settings without proper capability verification. The vulnerability does not require user interaction beyond authentication and can be exploited remotely over the network (AV:N). The attack complexity is low (AC:L), and privileges required are low (PR:L), meaning that even users with minimal access can exploit it. The impact is limited to integrity (I:L) with no confidentiality or availability impact. The scope is unchanged (S:U), indicating the vulnerability affects only the plugin’s own data and settings. No known exploits are currently in the wild, and no official patches have been released as of the publication date (October 24, 2025). The lack of authorization checks on AJAX endpoints means attackers can silently alter plugin configurations, potentially enabling further malicious activity or disrupting site functionality. Since WordPress is widely used across Europe, and the Supervisor plugin is likely deployed on many sites, this vulnerability poses a moderate risk to web infrastructure security.

For European organizations, this vulnerability could lead to unauthorized changes in WordPress plugin configurations, potentially undermining website integrity and stability. While it does not directly expose sensitive data or cause denial of service, altered settings could facilitate further attacks such as privilege escalation, injection of malicious code, or disruption of site operations. Organizations relying on WordPress for public-facing websites or internal portals may face reputational damage, operational interruptions, or increased risk of subsequent compromise. The ease of exploitation by low-privilege users increases the threat, especially in environments where multiple users have Subscriber or higher roles. This vulnerability is particularly concerning for organizations with large user bases or those that do not strictly enforce role-based access controls. Given the widespread use of WordPress in Europe, the potential impact spans multiple sectors including government, education, media, and commerce.

1. Immediately audit user roles and permissions in WordPress installations using the Supervisor plugin, ensuring that Subscriber-level users are limited and monitored. 2. Restrict Subscriber and other low-privilege roles from accessing or interacting with plugin AJAX endpoints by implementing custom capability checks or access controls at the web server or application level. 3. Monitor plugin settings and configuration changes through logging and alerting mechanisms to detect unauthorized modifications promptly. 4. Disable or uninstall the Supervisor plugin if it is not essential to reduce attack surface until a patch is available. 5. Follow the vendor’s updates closely and apply patches as soon as they are released. 6. Employ web application firewalls (WAFs) with rules targeting unauthorized AJAX requests to the plugin’s endpoints. 7. Educate site administrators and users about the risks of excessive privileges and enforce the principle of least privilege. 8. Consider implementing multi-factor authentication (MFA) to reduce the risk of compromised accounts being used to exploit this vulnerability.