The vulnerability identified as CVE-2025-13934 affects the Tutor LMS plugin for WordPress, widely used for e-learning and online course management. The root cause is a missing authorization check (CWE-862) in the `course_enrollment()` AJAX handler, which fails to verify whether the authenticated user has the necessary permissions or has completed the purchase process before enrolling in a course. This flaw allows any authenticated user with at least subscriber-level privileges to bypass payment and enrollment restrictions, granting unauthorized access to paid courses. The vulnerability affects all versions up to and including 3.9.3. The CVSS 3.1 base score is 4.3 (medium), reflecting that the attack vector is network-based, requires low attack complexity, and privileges at the subscriber level, but does not require user interaction. The impact is primarily on integrity, as unauthorized users can manipulate enrollment status, potentially leading to revenue loss for course providers and undermining trust in the LMS platform. No known exploits have been reported in the wild, but the vulnerability is publicly disclosed and should be addressed promptly. The lack of a patch link suggests that a fix may not yet be available, increasing the urgency for mitigation.

For European organizations, especially educational institutions, training providers, and enterprises relying on Tutor LMS for internal or external training, this vulnerability can lead to unauthorized access to paid or restricted courses. This undermines revenue models based on course purchases and may expose proprietary or sensitive training content to unauthorized users. While confidentiality and availability are not directly impacted, the integrity of course enrollment data is compromised, potentially affecting compliance with contractual or regulatory obligations related to content access. The financial impact could be significant for organizations monetizing courses. Additionally, unauthorized users gaining access to restricted training materials may lead to competitive disadvantages or intellectual property exposure. The medium severity rating indicates a moderate risk but one that should not be ignored, especially in sectors where e-learning is critical.

Organizations should immediately audit their Tutor LMS installations to identify affected versions (up to 3.9.3). Until an official patch is released, administrators should implement compensating controls such as restricting subscriber-level user creation, enforcing stricter user role management, and monitoring enrollment logs for suspicious activity. Custom code or plugins could be developed to add capability checks on the `course_enrollment()` AJAX endpoint, validating user permissions and purchase status before allowing enrollment. Additionally, organizations should consider temporarily disabling self-enrollment features or limiting enrollment capabilities to trusted roles only. Regularly updating WordPress and plugins, applying security hardening best practices, and monitoring for unusual access patterns will help reduce risk. Once a patch is available, prompt application is critical. Communication with users about the vulnerability and any temporary changes to enrollment processes is also advisable.