CVE-2025-11304 identifies a vulnerability in the CodeCanyon Mentor LMS product, specifically versions 1.1.0 and 1.1.1, where the application’s API component improperly implements cross-domain policies. This flaw results in a permissive cross-domain policy that includes untrusted domains, allowing remote attackers to bypass same-origin restrictions. The vulnerability does not require authentication or elevated privileges but does require some user interaction, such as visiting a malicious site that triggers cross-origin requests. The permissive policy can enable attackers to perform unauthorized actions like reading sensitive data or manipulating application state via cross-origin resource sharing (CORS) or Flash cross-domain policy files, depending on the implementation. The CVSS 4.0 score of 5.3 reflects medium severity, considering the network attack vector, low complexity, no privileges required, and user interaction needed. The impact on confidentiality, integrity, and availability is limited but non-negligible, as attackers could exploit this to steal session tokens, perform unauthorized actions, or cause data leakage. No patches or vendor responses are currently available, and while no active exploitation has been observed, published proof-of-concept exploits increase the risk of future attacks. Organizations using Mentor LMS should prioritize reviewing and hardening their cross-domain policies and monitor for suspicious activity related to cross-origin requests.

For European organizations, especially those in the education and training sectors using Mentor LMS, this vulnerability poses a risk of unauthorized data access and manipulation through cross-origin attacks. The permissive cross-domain policy could allow attackers to steal sensitive user information, such as session cookies or personal data, or perform unauthorized actions within the LMS environment. This can lead to confidentiality breaches, data integrity issues, and potential disruption of learning services. While the impact is medium severity, the lack of vendor response and patches increases exposure time. Organizations may face compliance risks under GDPR if personal data is compromised. Additionally, attackers could leverage this vulnerability as a foothold for further attacks within the network. The remote and unauthenticated nature of the exploit increases the threat surface, particularly in environments where users access LMS resources from browsers susceptible to cross-origin attacks.

1. Immediately review and restrict cross-domain policies in the Mentor LMS deployment, ensuring only trusted domains are allowed in CORS headers and cross-domain policy files. 2. Implement Content Security Policy (CSP) headers to limit the sources of executable scripts and frame ancestors. 3. Monitor web server and application logs for unusual cross-origin requests or suspicious referrers. 4. Educate users to avoid clicking on suspicious links or visiting untrusted websites while logged into the LMS. 5. If possible, deploy web application firewalls (WAF) with rules to detect and block malicious cross-origin requests targeting the LMS. 6. Isolate the LMS environment within a segmented network zone to limit lateral movement if exploited. 7. Regularly audit and update third-party components and dependencies related to cross-domain policies. 8. Engage with the vendor or community for updates or unofficial patches and consider alternative LMS solutions if the vendor remains unresponsive. 9. Conduct penetration testing focused on cross-origin vulnerabilities to identify and remediate weaknesses. 10. Prepare incident response plans specific to cross-origin attacks and data leakage scenarios.