CVE-2026-11559: CodeAstro Payroll System SQL Injection Vulnerability Analysis

Technical summary

CVE-2026-11559 is a SQL injection vulnerability (CWE-89, CWE-74) in CodeAstro Payroll System 1.0 affecting the /view_account.php file's ID parameter. The vulnerability stems from insufficient input validation and parameterization of user-supplied data before it is incorporated into SQL queries. The attack vector is network-based (AV:N) with low attack complexity (AC:L), requiring user privileges (PR:L) but no user interaction (UI:N). The vulnerability has a CVSS 3.1 score of 6.3 (Medium severity) with impacts to confidentiality, integrity, and availability (C:L/I:L/A:L).

Business impact

Payroll systems typically contain highly sensitive employee data including salaries, tax information, and personal identifiers. Successful exploitation could allow an authenticated attacker to extract, modify, or delete payroll records, leading to financial fraud, regulatory compliance violations, unauthorized employee data exposure, and operational disruption. For organizations relying on CodeAstro Payroll System, this creates risk of data breach notifications, reputational damage, and potential liability under data protection regulations.

Affected systems

CodeAstro Payroll System version 1.0 is vulnerable. Organizations using this product should immediately identify all affected instances in their environment, including development, testing, and production deployments. Verify your current CodeAstro version against vendor advisory documentation to determine if your installation is impacted.

Exploitability

The vulnerability is easily exploitable by any authenticated user with access to the /view_account.php file. The public availability of exploit code significantly lowers the barrier to attack and increases the likelihood of opportunistic exploitation. The requirement for user authentication (PR:L) is a limiting factor, but in many organizational settings, payroll system access is granted to finance and HR staff who may be targeted through social engineering, credential compromise, or insider threats.

Remediation

Apply the latest security patch from CodeAstro immediately. If patching cannot be completed urgently, implement network segmentation to restrict access to the payroll system to trusted internal networks only, apply Web Application Firewall (WAF) rules to block SQL injection patterns in the ID parameter, and conduct enhanced monitoring of database query logs for suspicious SQL activity. Verify any patches against official CodeAstro security advisories before deployment.

Patch guidance

Contact CodeAstro directly or consult their official security advisory for the latest patched version of Payroll System 1.0. Test patches thoroughly in a non-production environment before rolling out enterprise-wide. Given the public nature of exploits, prioritize patch deployment within 7-14 days of availability. Establish a rollback plan in case patch deployment causes operational issues.

Detection guidance

Monitor /view_account.php access logs for suspicious ID parameter values containing SQL metacharacters (e.g., quotes, semicolons, dashes, unions). Enable database query logging and alert on unusual query patterns, failed authentication attempts, or queries accessing multiple employee records in rapid succession. Review authentication logs for accounts accessing payroll data outside normal business hours or from unusual network locations. Implement intrusion detection signatures for common SQL injection payloads targeting payroll systems.

Why prioritize this

Although the CVSS score is Medium (6.3), this vulnerability warrants urgent attention due to: (1) public exploit availability significantly increasing attack likelihood, (2) the sensitive nature of payroll data targeted, (3) relatively low attack complexity requiring only authenticated access and basic SQL injection knowledge, and (4) potential for regulatory breach notification obligations. Organizations should prioritize this above other Medium-severity vulnerabilities without public exploits or authenticated requirements.

Risk score, explained

The CVSS 3.1 score of 6.3 reflects a network-accessible vulnerability requiring valid credentials but affecting confidentiality, integrity, and availability. The Medium severity rating appropriately captures the impact to payroll data confidentiality and the organization's operational continuity. However, the presence of public exploits, the high-value nature of payroll information, and the relative ease of exploitation by insiders or compromised accounts warrant risk prioritization above the base CVSS score alone.

Frequently asked questions