CVE-2025-59575 is a vulnerability identified in the Stylemix MasterStudy LMS plugin for WordPress, affecting versions up to and including 3.6.20. The flaw allows an attacker with some level of privileges (PR:L) to remotely retrieve embedded sensitive system information without requiring user interaction (UI:N). The vulnerability is classified as an exposure of sensitive system information to an unauthorized control sphere, meaning that data intended to be protected within the system is accessible to entities that should not have access. The CVSS v3.1 base score is 5.0 (medium severity), with an attack vector of network (AV:N), low attack complexity (AC:L), privileges required (PR:L), no user interaction (UI:N), and scope changed (S:C). The confidentiality impact is low (C:L), while integrity and availability impacts are none (I:N, A:N). This suggests that while the vulnerability does not allow modification or disruption of system functions, it leaks sensitive information that could be leveraged for further attacks or reconnaissance. The vulnerability affects the MasterStudy LMS plugin, a popular learning management system used primarily in WordPress environments to deliver online education content. The lack of known exploits in the wild and absence of linked patches at the time of publication indicates that exploitation may be limited currently but could increase once exploit code becomes available. The vulnerability was reserved in September 2025 and published in October 2025, indicating recent discovery and disclosure.

For European organizations, particularly educational institutions, training providers, and enterprises using MasterStudy LMS for e-learning, this vulnerability poses a confidentiality risk. Exposure of sensitive system information could include configuration details, system paths, or embedded credentials, which attackers could use to escalate privileges or conduct targeted attacks. While the vulnerability does not directly affect integrity or availability, the leaked information could facilitate lateral movement or further exploitation within the network. Given the increasing reliance on digital learning platforms in Europe, especially accelerated by remote learning trends, the impact could be significant in sectors handling sensitive personal data of students and staff. Additionally, compliance with GDPR mandates protection of personal data, and exposure of system information could indirectly lead to personal data breaches, resulting in regulatory penalties. Organizations with less mature security postures or those not regularly updating plugins are at higher risk. The medium severity rating reflects a moderate risk that should be addressed promptly to prevent escalation.

1. Immediately restrict access to the MasterStudy LMS administrative and backend interfaces using network-level controls such as IP whitelisting or VPN access to limit exposure to trusted users only. 2. Conduct a thorough audit of user privileges within the LMS to ensure that only necessary users have elevated permissions, minimizing the number of accounts that could exploit this vulnerability. 3. Monitor logs and network traffic for unusual access patterns or attempts to retrieve sensitive system information, enabling early detection of exploitation attempts. 4. Engage with the vendor or official plugin repository to obtain and apply patches or updates as soon as they become available. 5. If a patch is not yet available, consider temporarily disabling or replacing the affected plugin with alternative LMS solutions that do not have this vulnerability. 6. Implement web application firewall (WAF) rules to detect and block suspicious requests targeting known vulnerable endpoints within the MasterStudy LMS plugin. 7. Educate administrators and users about the risks and signs of exploitation to improve incident response readiness. 8. Regularly back up LMS data and configurations to enable recovery in case of subsequent attacks leveraging this vulnerability.