CVE-2025-64364 is a Local File Inclusion (LFI) vulnerability found in the StylemixThemes Masterstudy WordPress plugin, affecting versions prior to 4.8.126. The vulnerability arises from improper control over the filename parameter used in PHP include or require statements. This lack of validation allows an attacker to manipulate the input to include arbitrary files from the server's filesystem. Exploiting this vulnerability can lead to disclosure of sensitive files such as configuration files, password stores, or source code, and in some cases, it may enable remote code execution if combined with other vulnerabilities or misconfigurations. The vulnerability does not require authentication or user interaction, increasing its risk profile. No CVSS score has been assigned yet, and no public exploits are currently known. However, the vulnerability is publicly disclosed and should be treated as a serious risk due to the potential for data leakage and server compromise. The issue affects the Masterstudy plugin, which is widely used in educational and e-learning WordPress sites, making it a critical concern for organizations relying on this software. The vulnerability was published on October 31, 2025, and the vendor has not yet provided a patch link, indicating that users should monitor for updates and apply them promptly once available.

For European organizations, the impact of CVE-2025-64364 can be substantial, especially for those operating educational platforms or e-learning services using the Masterstudy plugin. Exploitation could lead to unauthorized access to sensitive data such as user credentials, personal information, or intellectual property. It may also enable attackers to execute arbitrary code on the web server, leading to full site compromise, defacement, or use of the server as a pivot point for further attacks within the network. This can result in reputational damage, regulatory penalties under GDPR due to data breaches, and operational disruptions. Organizations with limited cybersecurity maturity or those slow to apply patches are particularly vulnerable. The lack of authentication requirement and ease of exploitation increase the likelihood of automated scanning and exploitation attempts, raising the urgency for mitigation. Additionally, the educational sector in Europe is a high-profile target for cyberattacks, further elevating the risk.

1. Immediately monitor for and apply the official patch or update to Masterstudy version 4.8.126 or later once released by StylemixThemes. 2. Until a patch is available, implement web application firewall (WAF) rules to detect and block suspicious requests attempting to exploit file inclusion. 3. Restrict file system permissions on the web server to limit access to sensitive files and directories, minimizing the impact of potential LFI exploitation. 4. Conduct a thorough audit of the Masterstudy plugin configuration and code to identify and remediate any unsafe file inclusion patterns or user input handling. 5. Employ input validation and sanitization techniques to ensure that any parameters controlling file paths are strictly validated against a whitelist of allowed files. 6. Monitor web server logs for unusual access patterns or attempts to include unexpected files. 7. Educate site administrators on the risks and signs of exploitation to enable rapid detection and response. 8. Consider isolating the WordPress environment using containerization or sandboxing to limit lateral movement in case of compromise.