CVE-2025-65670 identifies an Insecure Direct Object Reference (IDOR) vulnerability in classroomio version 0.1.13, an educational platform. The vulnerability arises because the application fails to properly enforce access controls on URLs containing course IDs. Students can manipulate these course IDs in the URL to access endpoints intended only for administrators or teachers. This unauthorized access results in the temporary disclosure of sensitive data, including course details, administrative information, and student records. The leak is momentary, as the system eventually reverts to enforcing normal access restrictions, but even brief exposure can be exploited to harvest sensitive information. The vulnerability does not require authentication bypass but leverages insufficient authorization checks. No CVSS score has been assigned yet, and no public exploits are known. The lack of patch links suggests that a fix may not yet be available, increasing the urgency for organizations to implement compensating controls. The vulnerability highlights a common security failure in web applications where object references are exposed without proper validation, allowing attackers to escalate privileges or access unauthorized data by manipulating parameters.

For European organizations, particularly educational institutions using classroomio or similar platforms, this vulnerability threatens the confidentiality of sensitive educational data, including student records and administrative information. Unauthorized disclosure can lead to privacy violations under GDPR, resulting in legal penalties and reputational damage. The transient nature of the data leak does not mitigate the risk, as attackers can automate rapid data extraction. Integrity and availability impacts are minimal, but the breach of confidentiality alone is significant. The vulnerability could also facilitate further attacks if attackers gain insights into administrative functions or user roles. Given the widespread adoption of e-learning platforms across Europe, the potential scale of exposure is considerable. Organizations may face compliance challenges and loss of trust from students, parents, and staff if exploited.

1. Implement strict server-side authorization checks on all endpoints, ensuring that users can only access resources they are permitted to view. 2. Avoid exposing direct object references such as raw course IDs in URLs; use indirect references or tokens that are validated against user permissions. 3. Conduct thorough input validation and parameter sanitization to prevent manipulation of URL parameters. 4. Monitor access logs for unusual patterns indicative of IDOR exploitation attempts, such as rapid sequential access to different course IDs. 5. Apply the principle of least privilege in role assignments within the platform. 6. Engage with the vendor or development team to obtain patches or updates addressing this vulnerability. 7. Educate users and administrators about the risks of URL manipulation and encourage reporting of suspicious behavior. 8. Consider implementing Web Application Firewalls (WAFs) with rules to detect and block suspicious parameter tampering. 9. Perform regular security assessments and penetration testing focusing on access control mechanisms.