CVE-2025-11105 identifies a SQL injection vulnerability in the Simple Scheduling System version 1.0 developed by code-projects. The flaw exists in the /schedulingsystem/addsubject.php script, where the 'subcode' parameter is improperly sanitized, allowing attackers to inject arbitrary SQL queries. This vulnerability can be exploited remotely without requiring authentication or user interaction, making it accessible to a wide range of attackers. The injection can lead to unauthorized reading, modification, or deletion of database records, potentially compromising sensitive scheduling data. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), and partial impacts on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no active exploits have been observed in the wild, the public availability of exploit code increases the likelihood of exploitation attempts. The vulnerability affects only version 1.0 of the product, and no official patches have been linked yet. The lack of secure coding practices, such as parameterized queries or input validation, is the root cause. Organizations relying on this scheduling system should assess their exposure and implement mitigations promptly.

For European organizations, exploitation of this SQL injection vulnerability could lead to unauthorized access to sensitive scheduling data, including potentially personal or operational information. This could result in data breaches violating GDPR and other privacy regulations, leading to legal and financial repercussions. Integrity of scheduling data could be compromised, causing operational disruptions, mismanagement of resources, or denial of service if critical scheduling functions are affected. The remote and unauthenticated nature of the exploit increases the risk of widespread attacks, especially in sectors relying heavily on scheduling systems such as education, healthcare, and public administration. The medium severity suggests moderate but tangible risk, particularly for organizations that have not implemented compensating controls or are slow to patch. The absence of known active exploits currently provides a window for proactive defense, but the published exploit code means attackers could rapidly weaponize this vulnerability.

1. Immediate code review and remediation: Implement parameterized queries or prepared statements in the /schedulingsystem/addsubject.php file to prevent SQL injection. 2. Input validation: Enforce strict validation and sanitization of all user-supplied inputs, especially the 'subcode' parameter, to reject malicious payloads. 3. Network segmentation and access controls: Restrict access to the scheduling system to trusted internal networks or VPNs to reduce exposure. 4. Web application firewall (WAF): Deploy or update WAF rules to detect and block SQL injection attempts targeting this endpoint. 5. Monitoring and logging: Enable detailed logging of database queries and web requests to detect anomalous activity indicative of exploitation attempts. 6. Patch management: Monitor vendor announcements for official patches or updates and apply them promptly once available. 7. Incident response readiness: Prepare to respond to potential breaches by having data backups, forensic capabilities, and communication plans in place. 8. User awareness: Inform relevant IT and security teams about the vulnerability and ensure they understand the risk and mitigation steps.