CVE-2025-11553 identifies a SQL injection vulnerability in the Courier Management System 1.0 developed by code-projects. The vulnerability exists in the /add-courier.php endpoint, where the Shippername parameter is improperly sanitized, allowing an attacker to inject malicious SQL commands. This flaw enables remote attackers to manipulate backend SQL queries without requiring authentication or user interaction, potentially leading to unauthorized data access, data modification, or database corruption. The vulnerability has a CVSS 4.0 base score of 5.3 (medium severity), reflecting its moderate impact and ease of exploitation. Although no confirmed exploits are currently active in the wild, proof-of-concept exploit code has been publicly disclosed, increasing the likelihood of exploitation attempts. The vulnerability affects only version 1.0 of the Courier Management System, which is used to manage courier and shipment data. Exploitation could result in exposure of sensitive customer and shipment data, unauthorized changes to courier records, or denial of service due to database errors. The lack of authentication requirements and remote attack vector make this vulnerability particularly concerning for organizations that have exposed this system to external networks. No official patches or updates have been linked yet, so mitigation currently relies on input validation and restricting access to the vulnerable endpoint.

For European organizations using the affected Courier Management System 1.0, this vulnerability poses risks including unauthorized disclosure of sensitive shipment and customer data, data integrity violations through unauthorized modification of courier records, and potential service disruptions due to database errors or crashes. Logistics and delivery companies are particularly at risk, as they rely heavily on accurate and secure courier management systems. Exposure of shipment data could lead to privacy violations under GDPR, resulting in regulatory fines and reputational damage. Additionally, attackers could leverage the vulnerability to pivot into internal networks if the system is connected to broader enterprise infrastructure. The medium severity score reflects moderate impact, but the ease of remote exploitation without authentication increases urgency. European organizations with internet-facing deployments of this software are especially vulnerable. The absence of known active exploits reduces immediate risk but does not eliminate the threat, as public exploit code availability facilitates potential attacks.

1. Immediately restrict external access to the /add-courier.php endpoint by implementing network-level controls such as firewalls or VPNs to limit exposure. 2. Apply strict input validation and sanitization on the Shippername parameter to reject or escape malicious SQL characters. 3. Refactor the application code to use parameterized queries or prepared statements to prevent SQL injection. 4. Monitor logs for unusual or suspicious SQL query patterns or repeated access attempts to the vulnerable endpoint. 5. If possible, upgrade to a newer, patched version of the Courier Management System once available from the vendor. 6. Conduct a thorough security review of all input handling in the application to identify and remediate similar vulnerabilities. 7. Implement web application firewalls (WAF) with rules targeting SQL injection attempts to provide an additional layer of defense. 8. Educate IT and security teams about this vulnerability and ensure incident response plans include steps for SQL injection attacks. 9. Regularly back up databases and test restoration procedures to minimize impact in case of data corruption or loss.