CVE-2025-11108 is a SQL Injection vulnerability identified in version 1.0 of the code-projects Simple Scheduling System, specifically within the /schedulingsystem/addroom.php file. The vulnerability arises from improper sanitization or validation of the 'room' parameter, which is passed to a backend SQL query. An attacker can manipulate this parameter remotely without any authentication or user interaction to inject malicious SQL code. This can lead to unauthorized access to the underlying database, allowing attackers to read, modify, or delete sensitive scheduling data or potentially escalate their access within the system. The vulnerability has a CVSS 4.0 base score of 6.9, indicating a medium severity level. The attack vector is network-based (AV:N), requires no privileges (PR:N), no user interaction (UI:N), and has low impact on confidentiality, integrity, and availability individually but collectively can cause significant harm. The vulnerability is publicly disclosed but no known exploits are currently observed in the wild. The lack of a patch link suggests that a fix may not yet be available, increasing the risk for organizations using this software. Given that scheduling systems often integrate with organizational calendars, resource management, and user authentication systems, exploitation could lead to data leakage, disruption of scheduling operations, or serve as a foothold for further attacks within the network.

For European organizations, this vulnerability poses a moderate risk, especially for those relying on the Simple Scheduling System 1.0 for managing meeting rooms, appointments, or resource allocation. Exploitation could lead to unauthorized disclosure of sensitive scheduling information, impacting confidentiality. Integrity of scheduling data could be compromised, causing operational disruptions or conflicts. Availability impact is limited but possible if attackers manipulate or delete scheduling entries. In regulated sectors such as finance, healthcare, or government, unauthorized data access could lead to compliance violations under GDPR or other data protection laws, resulting in legal and reputational consequences. Additionally, since the vulnerability requires no authentication and can be exploited remotely, attackers could leverage this as an initial access vector to pivot into internal networks. The absence of known exploits currently reduces immediate risk but the public disclosure increases the likelihood of future exploitation attempts. Organizations using this software should consider the sensitivity of the data managed and the criticality of scheduling operations when assessing risk.

1. Immediate mitigation should include implementing input validation and parameterized queries or prepared statements in the addroom.php script to prevent SQL injection. 2. If source code modification is not feasible immediately, deploying a Web Application Firewall (WAF) with custom rules to detect and block SQL injection payloads targeting the 'room' parameter can reduce risk. 3. Monitor network traffic and application logs for suspicious activity related to the scheduling system, focusing on unusual or malformed requests to /schedulingsystem/addroom.php. 4. Restrict external access to the scheduling system to trusted networks or VPNs to limit exposure. 5. Conduct a thorough security review of the entire scheduling system to identify and remediate other potential injection points or vulnerabilities. 6. Engage with the vendor or community to obtain or develop patches and apply them promptly once available. 7. Educate IT and security teams about this vulnerability to ensure rapid detection and response to any exploitation attempts. 8. Consider isolating the scheduling system in a segmented network zone to minimize lateral movement if compromised.