CVE-2025-65594 identifies an Incorrect Access Control vulnerability in OpenSIS version 9.2 and earlier, specifically within the Student.php component. OpenSIS is an open-source student information system widely used by educational institutions to manage student data. The vulnerability allows an authenticated user with low privileges to bypass intended access restrictions and perform unauthorized write operations on the database records of other users. This means that a user who should only have limited access can alter or corrupt data belonging to other students or users, potentially affecting grades, attendance records, or personal information. The flaw arises from insufficient validation or enforcement of access control policies in the application logic handling database write requests. Exploitation requires the attacker to have valid credentials but does not require elevated privileges or additional user interaction. No CVSS score has been assigned yet, and no public exploits or patches have been reported as of the publication date. The vulnerability poses a significant risk to data integrity and confidentiality within affected OpenSIS deployments, especially in environments where strict data segregation is critical. The lack of a patch and public exploit suggests that organizations must proactively assess and mitigate the risk.

For European organizations, particularly educational institutions using OpenSIS, this vulnerability could lead to unauthorized modification of sensitive student data, violating data protection regulations such as GDPR. The integrity of academic records, attendance, and personal information could be compromised, undermining trust in the institution's data management. Unauthorized data writes could also facilitate fraudulent activities or disrupt administrative processes. The breach of confidentiality and integrity may result in legal liabilities, reputational damage, and operational disruptions. Since the vulnerability requires authentication but no elevated privileges, insider threats or compromised user accounts pose a significant risk. The impact extends to any integrated systems relying on OpenSIS data, potentially cascading to broader institutional IT infrastructure.

Organizations should immediately audit user roles and permissions within OpenSIS to ensure least privilege principles are enforced. Restrict access to the Student.php component and related database write functionalities to only trusted and necessary users. Implement monitoring and alerting for unusual database write activities or access patterns. Employ multi-factor authentication to reduce the risk of credential compromise. Where possible, isolate OpenSIS systems within secure network segments and apply strict firewall rules. Engage with OpenSIS vendors or community to obtain patches or updates addressing this vulnerability once available. In the interim, consider manual code reviews or temporary access control enhancements to block unauthorized write attempts. Regularly back up student data to enable recovery in case of unauthorized modifications. Finally, educate users about the risks of credential sharing and phishing attacks that could lead to account compromise.