CVE-2026-1535 is an SQL injection vulnerability identified in the code-projects Online Music Site version 1.0, located in the /Administrator/PHP/AdminReply.php file. The vulnerability arises from improper sanitization of the 'ID' parameter, which can be manipulated remotely without authentication or user interaction. This flaw allows attackers to inject malicious SQL commands, potentially leading to unauthorized data retrieval, modification, or deletion within the backend database. The vulnerability is exploitable over the network (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and has low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L), resulting in a CVSS 4.0 score of 6.9 (medium severity). Although no known exploits are currently active, the public disclosure increases the risk of exploitation by attackers. The affected product is a niche online music site platform, which may be used by small to medium enterprises or music-related organizations. The lack of available patches or vendor advisories necessitates immediate defensive measures by users. The vulnerability's exploitation could lead to data breaches, unauthorized administrative actions, or service disruptions, impacting business operations and user trust.

For European organizations using the code-projects Online Music Site 1.0, this vulnerability poses a significant risk of unauthorized access to sensitive data stored in the backend database, including potentially user information, administrative data, or proprietary content. Exploitation could lead to data leakage, data tampering, or denial of service, undermining confidentiality, integrity, and availability. Given the administrative context of the vulnerable file, attackers might gain elevated privileges or manipulate administrative functions, exacerbating the impact. Organizations in the music industry or digital content providers in Europe could suffer reputational damage and regulatory penalties under GDPR if personal data is compromised. The remote and unauthenticated nature of the exploit increases the attack surface, especially if administrative interfaces are exposed to the internet without adequate network segmentation or access controls. The absence of known active exploits currently reduces immediate risk but does not eliminate the threat, especially with public disclosure enabling potential attackers to develop exploits.

1. Immediately restrict access to the /Administrator/PHP/AdminReply.php endpoint using network-level controls such as firewalls or VPNs to limit exposure to trusted administrators only. 2. Implement input validation and sanitization on the 'ID' parameter to ensure only expected numeric or alphanumeric values are accepted, rejecting any suspicious input. 3. Refactor the vulnerable code to use parameterized queries or prepared statements to prevent SQL injection attacks. 4. Conduct a thorough code audit of the entire application to identify and remediate any other injection or input validation weaknesses. 5. Monitor web server and application logs for unusual or suspicious requests targeting the vulnerable endpoint. 6. If possible, isolate the affected application in a segmented network zone to limit lateral movement in case of compromise. 7. Engage with the vendor or community to obtain or develop patches or updated versions addressing the vulnerability. 8. Educate administrators on secure usage practices and the importance of not exposing administrative interfaces publicly. 9. Consider deploying Web Application Firewalls (WAF) with custom rules to detect and block SQL injection attempts targeting this endpoint.