CVE-2025-59576 is a Missing Authorization vulnerability (CWE-862) identified in the Stylemix MasterStudy LMS product, affecting versions up to 3.6.20. This vulnerability arises from incorrectly configured access control security levels, allowing users with limited privileges (requiring low privilege level) to perform unauthorized actions that should be restricted. The CVSS 3.1 base score is 6.5, indicating a medium severity level. The vector string (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N) reveals that the vulnerability is remotely exploitable over the network without user interaction, requires low privileges (authenticated user), and impacts the integrity of the system but not confidentiality or availability. Specifically, the vulnerability allows an authenticated user to bypass authorization checks, potentially modifying or manipulating LMS data or functionality beyond their permitted scope. Since MasterStudy LMS is a widely used learning management system, this flaw could enable malicious insiders or compromised accounts to escalate their privileges or alter course content, grades, or user data, undermining the integrity of the educational environment. No known exploits are reported in the wild yet, and no patches have been linked at the time of publication, indicating that organizations using this LMS should prioritize assessment and mitigation to prevent exploitation.

For European organizations, especially educational institutions, training providers, and corporate learning departments using Stylemix MasterStudy LMS, this vulnerability poses a significant risk to the integrity of their learning platforms. Unauthorized modification of course materials, grades, or user roles could disrupt educational processes, damage reputations, and violate compliance requirements such as GDPR if user data integrity is compromised. The medium severity score reflects that while confidentiality and availability are not directly impacted, the integrity breach could lead to misinformation, loss of trust, and operational disruptions. Given the remote exploitability and lack of required user interaction, attackers with low-level access could leverage this vulnerability to escalate privileges or manipulate LMS content, potentially affecting thousands of users in large deployments. This is particularly critical in Europe where digital education platforms are increasingly mandated and regulated, and where data integrity is paramount for certification and accreditation processes.

Organizations should immediately audit their MasterStudy LMS deployments to identify affected versions (up to 3.6.20). Since no official patches are currently linked, administrators should implement strict access control reviews, ensuring that user roles and permissions are correctly configured to minimize privilege exposure. Employing network segmentation and limiting LMS administrative access to trusted IP ranges can reduce attack surface. Monitoring LMS logs for unusual activity related to privilege escalation or unauthorized modifications is essential. Additionally, organizations should engage with Stylemix for updates or patches and apply them promptly once available. Implementing multi-factor authentication (MFA) for all LMS users can further reduce the risk of compromised accounts being used to exploit this vulnerability. Finally, consider deploying web application firewalls (WAF) with custom rules to detect and block suspicious requests targeting authorization bypass attempts.