CVE-2026-12131: SQL Injection in CodeAstro HRMS Payroll Invoice Module

Technical summary

CVE-2026-12131 is a SQL injection flaw (CWE-89) combined with improper input validation (CWE-74) in the Invoice function of \application\controllers\Payroll.php within CodeAstro HRMS 1.0. The ID parameter is not properly sanitized before being used in SQL queries, allowing authenticated users to craft malicious input that alters query logic. The CVSS 3.1 score of 6.3 reflects the need for prior authentication (PR:L), remote accessibility (AV:N), and low attack complexity (AC:L), with impacts spanning confidentiality, integrity, and availability. The availability of public exploit code significantly reduces the barrier to weaponization.

Business impact

A successful exploitation could expose sensitive payroll data, employee personal information, and financial records stored in the HRMS database. Attackers with valid credentials—whether internal malicious actors or compromised accounts—could modify payroll records, create fraudulent invoices, or delete audit trails. For HR departments relying on this system for compliance and reporting, data corruption could disrupt payroll processing and trigger regulatory violations. The reputational and legal costs of a payroll data breach are substantial.

Affected systems

CodeAstro Human Resource Management System version 1.0 is affected. Organizations running this specific version with the Payroll Invoice Module exposed to authenticated users are at risk. The vulnerability does not affect other versions or products unless they share the same codebase. Verify your CodeAstro deployment version and assess whether the Payroll module is accessible to internal users or integrated with external systems.

Exploitability

Exploitation requires valid application credentials, which limits the attack surface to authenticated users—insiders or those with compromised accounts. However, the attack is straightforward: an attacker simply needs to inject SQL syntax into the ID parameter of an invoice request. The existence of public exploits removes the need for custom development and significantly lowers the technical bar. Organizations with weak password policies, poor access controls, or employees with overly permissive roles face elevated risk.

Remediation

Upgrade CodeAstro Human Resource Management System to a version that patches this vulnerability. Verify the available patch version in the official CodeAstro vendor advisory. As an interim mitigation, implement input validation and parameterized queries (prepared statements) to prevent SQL injection. Apply the principle of least privilege to restrict database and application access. Monitor and limit which users can access the Payroll Invoice Module.

Patch guidance

Contact CodeAstro directly or consult their security advisory for the specific patched version number addressing CVE-2026-12131. Apply patches to all systems running HRMS 1.0 in your environment. Test the patch in a staging environment before production deployment to ensure payroll processing workflows remain intact. If a patch is not immediately available, escalate to CodeAstro for an expected timeline and request temporary workarounds.

Detection guidance

Monitor database logs for unusual SQL patterns in queries generated by the Payroll Invoice Module, particularly those containing SQL keywords (UNION, SELECT, OR, comment syntax) in the ID parameter field. Log all access to payroll-related functions and cross-reference against user roles. Implement Web Application Firewall (WAF) rules to detect and block common SQL injection payloads targeting the invoice endpoint. Enable verbose application logging to capture parameter values during HTTP requests to \application\controllers\Payroll.php.

Why prioritize this

Although the CVSS score is medium (6.3), the combination of public exploit availability, direct access to sensitive payroll data, and the authenticated-but-common nature of internal user access elevates practical priority. Payroll systems are mission-critical and often heavily audited; a breach or compromise could trigger incident response, forensics, and regulatory notification obligations. This vulnerability should be patched or mitigated urgently, especially if your organization has elevated insider-threat concerns or if payroll system accounts are shared among multiple users.

Risk score, explained

The CVSS 3.1 score of 6.3 (MEDIUM) reflects the attack vector requiring authentication (PR:L) and low complexity (AC:L), with confidentiality, integrity, and availability impacts all present. The score does not explicitly account for public exploit availability, which is a powerful amplifier in real-world risk. Adjust your internal risk rating upward if your HR staff has broad access to the payroll module, if the HRMS is internet-facing, or if you have had previous incidents involving insider threats or credential compromise.

Frequently asked questions