CVE-2026-11558: SQL Injection in CodeAstro Payroll System 1.0

Technical summary

CVE-2026-11558 is a SQL injection vulnerability (CWE-89) stemming from improper input validation in the /home_salary.php endpoint of CodeAstro Payroll System 1.0. The rate/salary_rate parameter is processed directly in database queries without parameterized statements or sufficient sanitization. An authenticated attacker can craft SQL payloads within this parameter to execute arbitrary database operations. The attack vector is network-accessible (CVSS:3.1/AV:N), requires valid credentials (PR:L), and does not require user interaction (UI:N), resulting in a CVSS v3.1 score of 6.3 (MEDIUM).

Business impact

Exploitation enables attackers with valid credentials to exfiltrate payroll records, manipulate salary data, or corrupt the underlying database. This directly threatens data confidentiality and integrity of sensitive employee information, regulatory compliance (GDPR, local labor laws), and operational continuity. Organizations running CodeAstro Payroll System 1.0 face risk of financial fraud, employee record tampering, and potential legal liability stemming from unauthorized data access or modification.

Affected systems

CodeAstro Payroll System version 1.0 is explicitly affected. Organizations using this product should immediately inventory affected instances, including development, staging, and production environments. No newer patched versions have been specified in available data; verify the vendor's current release status and upgrade path directly with CodeAstro.

Exploitability

The vulnerability carries a lower technical barrier to exploitation than network-unauthenticated SQL injection, since it requires valid user credentials (PR:L). However, the public disclosure of this vulnerability increases risk that attackers may target organizations using known employee or contractor accounts. The attack requires no special conditions—any network user with valid credentials can attempt exploitation without additional privileges or social engineering. Active exploitation should be assumed as probable given public availability.

Remediation

Immediate action: upgrade CodeAstro Payroll System to a patched version released after 2026-06-17; contact the vendor for available releases and timelines. Interim mitigations include applying network segmentation to restrict /home_salary.php access to authorized IP ranges, enforcing strong authentication policies, and monitoring database query logs for anomalous SQL patterns. Verify that the upgraded version includes parameterized query implementation and input validation for rate/salary_rate.

Patch guidance

Coordinate with CodeAstro to confirm patch availability and version numbers for CodeAstro Payroll System 1.0. Vendor advisories should specify the minimum version required. Deploy patches first in a staging environment to validate payroll functionality, then schedule production updates during low-activity windows to avoid disruption to payroll cycles. After patching, re-run SQL injection testing on the /home_salary.php endpoint to confirm remediation.

Detection guidance

Monitor access logs for /home_salary.php endpoints for unusual request patterns or encoding anomalies in the rate/salary_rate parameter. Search database transaction logs for unexpected SQL commands (UNION, INSERT, UPDATE, DELETE) initiated from the payroll application. Implement Web Application Firewall (WAF) rules to block common SQL injection payloads in this parameter. Log failed database authentication attempts and privilege escalation queries. Alert on any attempts to query sensitive payroll schema or exfiltrate bulk employee records.

Why prioritize this

Although scored MEDIUM (6.3), this vulnerability affects payroll processing—mission-critical infrastructure with direct financial and compliance implications. Public disclosure combined with low exploitation complexity for authenticated users elevates practical risk. Prioritize patching systems handling sensitive or large employee populations, particularly those with internet-facing payroll portals or contractor management workflows.

Risk score, explained

CVSS v3.1 6.3 reflects: network accessibility (AV:N) and low attack complexity (AC:L) offset by the requirement for authenticated access (PR:L). Impact is bounded to MEDIUM across confidentiality, integrity, and availability (C:L/I:L/A:L) because the attacker cannot escalate to system-level compromise. The scope is unchanged (S:U). The score does not account for organizational context—a payroll system handling thousands of employees carries amplified business risk despite the moderate technical score.

Frequently asked questions