CVE-2025-6835 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Library System, specifically affecting the /student-issue-book.php file. The vulnerability arises from improper sanitization or validation of the 'reg' parameter, which is used in SQL queries. An attacker can remotely manipulate this parameter to inject malicious SQL code, potentially allowing unauthorized access to the underlying database. This can lead to unauthorized data disclosure, data modification, or even complete compromise of the database server. The vulnerability does not require authentication or user interaction, making it exploitable remotely by any attacker with network access to the affected system. Although the CVSS v4.0 score is 6.9 (medium severity), the description rates it as critical, reflecting the high risk associated with SQL injection flaws. The exploit has been publicly disclosed, increasing the risk of exploitation, although no known active exploits have been reported in the wild yet. The lack of available patches or mitigation links indicates that organizations using this software version may currently be unprotected against this threat.

For European organizations using the code-projects Library System 1.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of sensitive data, including student records and library transaction information. Exploitation could lead to unauthorized data extraction, data tampering, or denial of service, disrupting library operations and potentially exposing personal data protected under GDPR. Given the remote and unauthenticated nature of the attack, threat actors could easily target vulnerable systems over the internet or internal networks. This could result in reputational damage, regulatory penalties, and operational disruptions for educational institutions and libraries across Europe. The public disclosure of the exploit increases the urgency for mitigation to prevent opportunistic attacks.

Organizations should immediately audit their deployments of the code-projects Library System to identify any instances of version 1.0. Since no official patches are currently available, temporary mitigations include implementing web application firewall (WAF) rules to detect and block SQL injection attempts targeting the 'reg' parameter in /student-issue-book.php. Input validation and parameterized queries should be enforced if source code access is available, rewriting the vulnerable code to use prepared statements. Network segmentation and restricting access to the application to trusted internal networks can reduce exposure. Monitoring logs for suspicious database queries or unusual application behavior is critical to detect potential exploitation attempts. Organizations should also engage with the vendor or community for updates or patches and plan for an immediate upgrade once a fixed version is released.