CVE-2026-13535: SQL Injection in CodeAstro HR System 1.0

Technical summary

CVE-2026-13535 is a SQL injection flaw in the GetFileInfo function within hrsystem/application/models/Employee_model.php. The vulnerability exists in the View Endpoint component and stems from insufficient input validation on the ID argument. An attacker with valid authentication can craft a malicious ID parameter to execute arbitrary SQL queries. The vulnerability is classified as CWE-89 (SQL Injection) with contributing factors from CWE-74 (Improper Neutralization of Special Elements in Output). The attack vector is network-based with low complexity, requiring only a valid user account.

Business impact

A successful exploitation could expose sensitive employee records including personal information, compensation data, benefits history, and performance reviews. Attackers could modify HR records to create fraudulent employee entries, alter payroll data, or delete critical employment documentation. In regulated industries, unauthorized access to HR databases triggers compliance violations (GDPR, HIPAA, SOX) and potential notification obligations. The reputational damage from an HR system compromise extends beyond data loss to questions about employee trust and operational integrity.

Affected systems

CodeAstro Human Resource Management System version 1.0 is the sole confirmed affected product. Organizations running this version in production environments are at direct risk, particularly those with internet-accessible deployment or weak access controls. The vulnerability does not affect other versions at this time, but this should be verified against CodeAstro's official advisory.

Exploitability

The exploit has been publicly disclosed, reducing the barrier to weaponization. Exploitation requires valid authentication—an attacker must have a legitimate user account or compromised credentials—which moderately limits but does not prevent opportunistic attacks, especially in environments with poor credential hygiene. The technical difficulty is low; SQL injection in unvalidated parameters is well-understood and straightforward to execute. Remote network access means attackers can attempt exploitation from anywhere, making this a realistic threat if exposed to untrusted networks.

Remediation

Obtain and deploy a patched version of CodeAstro Human Resource Management System from the vendor. If an immediate patch is unavailable, implement compensating controls: restrict network access to the HR system via firewall rules or VPN, enforce strong authentication with multi-factor authentication, and audit user activity logs for suspicious ID parameter patterns. Additionally, apply input validation and parameterized queries at the application level if source code access is available. Do not delay patching in favor of compensating controls alone.

Patch guidance

Check CodeAstro's official security advisories and release notes for the availability and version number of patches addressing CVE-2026-13535. Apply patches promptly to production systems after testing in a non-production environment to verify compatibility and functionality. If the vendor has not released a patch, establish a timeline for deployment once available and document the business justification for any temporary exceptions. Verify patch application by confirming the updated file hrsystem/application/models/Employee_model.php includes proper input sanitization.

Detection guidance

Monitor HR system logs for unusual SQL syntax in URL parameters, particularly patterns containing UNION, SELECT, OR, SLEEP, or similar SQL keywords within ID arguments. Set alerts for authentication events followed immediately by failed database queries or unusual data access patterns. Use web application firewalls (WAF) to detect and block common SQL injection payloads targeting the View Endpoint. Regularly review access logs for users accessing employee records outside their typical job function. In a mature security environment, implement database activity monitoring to detect anomalous SQL queries originating from the application layer.

Why prioritize this

While this vulnerability carries a MEDIUM CVSS score, prioritization should be elevated if the HR system is internet-accessible, contains unencrypted sensitive data, or serves a regulated industry. The public availability of exploit code and the low attack complexity warrant faster remediation than the base CVSS might suggest. However, the requirement for valid authentication provides a modest window for remediation without emergency-level incident response—organizations should patch within standard timelines rather than treat this as zero-day critical.

Risk score, explained

The CVSS 3.1 score of 6.3 reflects a network-accessible vulnerability requiring low technical skill to exploit but demanding user authentication. The scoring balances the serious confidentiality, integrity, and availability impact (all Low) against the authentication barrier and lack of privilege escalation. This score is appropriate for an authenticated SQL injection but does not account for business context; HR data sensitivity and regulatory exposure may warrant higher internal risk ratings independent of the standard score.

Frequently asked questions