CVE-2025-64214 is a missing authorization vulnerability identified in StylemixThemes MasterStudy LMS Pro, affecting all versions prior to 4.7.16. The flaw arises from improper or absent Access Control Lists (ACLs) on certain functionalities within the LMS, allowing unauthenticated remote attackers to access sensitive features or data that should be restricted. The vulnerability is exploitable over the network without requiring any privileges or user interaction, making it highly accessible to attackers. The CVSS v3.1 score of 7.5 reflects the high impact on confidentiality, as attackers can retrieve sensitive information without authorization, though integrity and availability remain unaffected. No public exploits have been reported yet, but the nature of the vulnerability suggests that exploitation could lead to data leakage of student records, course materials, or administrative information. The LMS is widely used in educational institutions, which often handle personal and academic data, increasing the risk profile. The lack of patch links indicates that a fix may be pending or recently released, emphasizing the need for vigilance. The vulnerability was reserved in late October 2025 and published in December 2025, indicating recent discovery and disclosure.

For European organizations, especially educational institutions and e-learning providers using MasterStudy LMS Pro, this vulnerability poses a significant risk to the confidentiality of sensitive data such as student personal information, grades, and course content. Unauthorized access could lead to data breaches, regulatory non-compliance (e.g., GDPR violations), reputational damage, and potential legal consequences. Since the vulnerability does not require authentication or user interaction, attackers can exploit it remotely, increasing the attack surface. The impact is particularly critical for institutions with large user bases or those hosting sensitive research or proprietary educational content. Additionally, the exposure of confidential data could be leveraged for further attacks such as phishing or social engineering campaigns targeting European users. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate the threat, as attackers may develop exploits rapidly following disclosure.

1. Immediately monitor StylemixThemes official channels and security advisories for patches addressing CVE-2025-64214 and apply updates to MasterStudy LMS Pro as soon as they become available. 2. Until patches are applied, restrict network access to the LMS administration and sensitive endpoints using firewalls or VPNs to limit exposure to trusted users only. 3. Implement strict network segmentation to isolate the LMS from public-facing systems and reduce the attack surface. 4. Conduct thorough access control reviews within the LMS to identify and temporarily disable any non-essential or high-risk functionalities that may be vulnerable. 5. Enable detailed logging and monitoring of LMS access to detect any anomalous or unauthorized activity promptly. 6. Educate IT and security teams about the vulnerability to ensure rapid response and incident handling. 7. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block exploitation attempts targeting missing authorization flaws. 8. Review and enhance overall identity and access management policies to minimize risks from similar vulnerabilities in the future.