CVE-2025-7130 is a critical SQL Injection vulnerability identified in version 1.0 of the Campcodes Payroll Management System. The vulnerability exists in the /ajax.php endpoint, specifically in the action parameter 'delete_payroll' where the 'ID' argument is improperly sanitized. This flaw allows an unauthenticated remote attacker to inject malicious SQL code by manipulating the 'ID' parameter, potentially enabling unauthorized access to the backend database. The vulnerability does not require any authentication or user interaction, making it highly exploitable over the network. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the ease of exploitation (network vector, low attack complexity) but limited impact on confidentiality, integrity, and availability (each rated low). Although no public exploits are currently known in the wild, the vulnerability details have been disclosed publicly, increasing the risk of exploitation by threat actors. The lack of available patches or mitigations from the vendor further exacerbates the risk. Given the nature of payroll systems, successful exploitation could lead to unauthorized disclosure or modification of sensitive employee financial data, disruption of payroll processing, and potential compliance violations.

For European organizations using Campcodes Payroll Management System 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of payroll data. Attackers exploiting this flaw could extract sensitive employee information such as salaries, bank details, and personal identifiers, leading to privacy breaches and potential identity theft. Integrity of payroll records could be compromised, resulting in financial fraud or payroll manipulation. Availability impact is limited but could occur if attackers execute destructive SQL commands. Given the critical nature of payroll data under GDPR and other European data protection regulations, exploitation could result in regulatory penalties and reputational damage. Organizations relying on this system for payroll processing may face operational disruptions and increased incident response costs. The remote, unauthenticated nature of the vulnerability increases the attack surface, especially for organizations exposing the payroll management system to external networks or lacking robust network segmentation.

Immediate mitigation should focus on restricting external access to the vulnerable /ajax.php endpoint by implementing network-level controls such as firewalls or VPNs to limit access to trusted internal users only. Organizations should conduct a thorough code review and apply input validation and parameterized queries to sanitize the 'ID' parameter and prevent SQL injection. In the absence of an official patch, deploying Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection payloads targeting the 'delete_payroll' action can provide temporary protection. Regularly monitor logs for suspicious activity related to this endpoint. Additionally, organizations should isolate the payroll management system from other critical infrastructure to contain potential breaches. It is critical to engage with the vendor for patch availability and apply updates promptly once released. Finally, perform comprehensive backups of payroll data and test recovery procedures to mitigate impact from potential data corruption or loss.