CVE-2025-5638 is a SQL Injection vulnerability identified in version 1.0 of the PHPGurukul Notice Board System, specifically within the /admin-profile.php file. The vulnerability arises due to improper sanitization or validation of the 'mobilenumber' parameter, which is susceptible to malicious input manipulation. An attacker can remotely exploit this flaw by injecting crafted SQL queries through the 'mobilenumber' argument, potentially allowing unauthorized access to the backend database. This could lead to unauthorized data disclosure, data modification, or even complete compromise of the application's data integrity. The vulnerability does not require user interaction and can be exploited without authentication, increasing its risk profile. Although the CVSS 4.0 base score is 5.3 (medium severity), the presence of remote exploitability and lack of authentication requirements make it a significant concern. The description also suggests that other parameters might be vulnerable, indicating a broader issue with input validation in the affected application. No official patches have been released yet, and no known exploits are currently observed in the wild, but public disclosure of the exploit code increases the likelihood of future attacks.

For European organizations using the PHPGurukul Notice Board System 1.0, this vulnerability poses a risk of unauthorized access to sensitive administrative data and potentially other database contents. Exploitation could lead to data breaches involving personal or organizational information, impacting confidentiality and integrity. The Notice Board System is typically used for internal communications; compromise could disrupt organizational workflows or be leveraged as a foothold for further network intrusion. Given the remote exploitability without authentication, attackers could target exposed instances over the internet, increasing the attack surface. The medium CVSS score reflects moderate impact, but the potential for data leakage or manipulation could have regulatory implications under GDPR, leading to legal and financial consequences for affected European entities.

Immediate mitigation steps include implementing strict input validation and sanitization on all user-supplied parameters, especially 'mobilenumber' in /admin-profile.php. Organizations should conduct a thorough code audit of the Notice Board System to identify and remediate similar injection points. Employing parameterized queries or prepared statements is critical to prevent SQL injection. Network-level controls such as web application firewalls (WAFs) can be configured to detect and block SQL injection attempts targeting this parameter. Until an official patch is released, restricting access to the admin interface to trusted IP addresses or VPNs can reduce exposure. Monitoring logs for suspicious query patterns related to 'mobilenumber' inputs can help detect exploitation attempts early. Additionally, organizations should consider upgrading or replacing the affected software with more secure alternatives if feasible.