CVE-2025-15406 is a vulnerability identified in PHPGurukul's Online Course Registration software versions 3.0 and 3.1. The core issue is a missing authorization check in an unspecified function within the application, which allows remote attackers to perform unauthorized actions. The vulnerability is exploitable remotely without requiring user interaction or elevated privileges, indicating that an attacker can directly send crafted requests to the affected system to bypass authorization controls. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact on confidentiality, integrity, and availability, with low complexity and no need for authentication or user interaction. Although the exact function affected is not detailed, missing authorization typically means that sensitive operations such as modifying user data, course registrations, or administrative functions could be accessed by unauthorized users. No patches or fixes have been linked yet, and no active exploitation has been reported, but the availability of proof-of-concept exploits increases the risk of future attacks. The vulnerability affects educational institutions or organizations using PHPGurukul's software for managing online course registrations, potentially exposing sensitive student or course data and enabling unauthorized changes to registrations or system configurations.

For European organizations, particularly educational institutions and training providers using PHPGurukul Online Course Registration software, this vulnerability could lead to unauthorized access to sensitive student information, course enrollment data, and administrative functions. This may result in data breaches violating GDPR requirements, unauthorized manipulation of course registrations, and disruption of educational services. The integrity of course records could be compromised, affecting academic outcomes and institutional reputation. Availability impacts are likely limited but could occur if attackers exploit the flaw to disrupt registration processes. The medium severity and ease of remote exploitation without authentication increase the urgency for organizations to assess their exposure. Given the critical role of educational data and compliance obligations in Europe, exploitation could lead to regulatory penalties and loss of trust among students and stakeholders.

Organizations should immediately audit their PHPGurukul Online Course Registration deployments to identify if versions 3.0 or 3.1 are in use. Until official patches are released, implement compensating controls such as network-level restrictions to limit access to the application to trusted IP ranges. Conduct thorough code reviews to identify and add missing authorization checks on all sensitive functions, ensuring that only properly authenticated and authorized users can perform critical operations. Monitor application logs for unusual access patterns or unauthorized attempts. Engage with the vendor or community for updates and patches, and plan prompt upgrades once fixes are available. Additionally, enforce strong authentication mechanisms and consider multi-factor authentication for administrative access. Regularly back up course registration data to enable recovery in case of tampering or disruption.