CVE-2025-13420 is a SQL injection vulnerability identified in itsourcecode Human Resource Management System version 1.0. The vulnerability arises from improper sanitization of the eventSubject parameter in the /src/store/EventStore.php file, which is used in SQL queries without adequate validation or parameterization. This allows a remote attacker to craft malicious input that alters the intended SQL commands executed by the backend database. Since the attack vector is network accessible and requires no authentication or user interaction, it can be exploited remotely and autonomously. The vulnerability can lead to unauthorized data disclosure, modification, or deletion, impacting the confidentiality, integrity, and availability of the HRMS data. The CVSS 4.0 base score is 6.9 (medium), reflecting the ease of exploitation and the partial impact on data security. Although no active exploits have been reported in the wild, the public availability of exploit code increases the likelihood of attacks. The affected software is used for managing sensitive human resource data, making this vulnerability particularly concerning for organizations that store employee personal information, payroll data, and other confidential records. The lack of vendor patches or official remediation guidance at the time of publication necessitates immediate defensive measures by users of the affected version.

For European organizations using itsourcecode Human Resource Management System 1.0, this vulnerability could lead to unauthorized access to sensitive employee and organizational data, including personal identifiable information (PII), payroll, and HR records. Exploitation could result in data breaches, regulatory non-compliance (e.g., GDPR violations), reputational damage, and potential operational disruptions if data integrity or availability is compromised. Attackers could manipulate or exfiltrate data, potentially leading to insider threat scenarios or fraud. The medium severity indicates a significant risk that could escalate if combined with other vulnerabilities or insider threats. Given the remote and unauthenticated nature of the exploit, attackers can target vulnerable systems over the internet, increasing exposure. European organizations in sectors with strict data protection requirements, such as finance, healthcare, and government, may face heightened consequences. The lack of patches increases the urgency for interim mitigations to prevent exploitation.

1. Immediately implement input validation and sanitization for the eventSubject parameter to prevent malicious SQL code injection. 2. Employ parameterized queries or prepared statements in the EventStore.php file to eliminate direct concatenation of user input into SQL commands. 3. Restrict network access to the HRMS application, limiting exposure to trusted internal networks or VPNs where possible. 4. Monitor database logs and application logs for unusual query patterns or repeated failed attempts indicative of SQL injection attempts. 5. Conduct a thorough code review of the HRMS application to identify and remediate other potential injection points. 6. If vendor patches become available, prioritize their deployment. 7. Implement web application firewalls (WAF) with SQL injection detection rules tailored to the HRMS environment. 8. Educate system administrators and security teams on the vulnerability and signs of exploitation to enable rapid incident response. 9. Consider isolating the HRMS system or deploying it within segmented network zones to limit lateral movement in case of compromise. 10. Regularly back up HRMS data and verify backup integrity to enable recovery from potential data tampering or loss.