CVE-2026-5719: Construction Management System SQL Injection

CVE-2026-5719 Overview

A SQL Injection vulnerability has been identified in itsourcecode Construction Management System version 1.0. This flaw exists in the /borrowedtool.php file where manipulation of the code argument can lead to SQL injection attacks. The vulnerability can be exploited remotely by authenticated attackers to manipulate database queries, potentially allowing unauthorized access to sensitive data, data modification, or further system compromise.

Critical Impact

Remote attackers with low privileges can exploit this SQL injection flaw to bypass security controls, extract sensitive construction project data, modify database records, or potentially escalate their access within the application.

Affected Products

• itsourcecode Construction Management System 1.0
• /borrowedtool.php endpoint

Discovery Timeline

• 2026-04-07 - CVE-2026-5719 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-5719

Vulnerability Analysis

This vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly referred to as injection. The flaw resides in the /borrowedtool.php file of the Construction Management System application, where user-supplied input through the code parameter is not properly sanitized before being incorporated into SQL queries.

The root cause is the lack of proper input validation and parameterized queries when processing the code argument. When user input is directly concatenated into SQL statements without sanitization, attackers can inject malicious SQL syntax to alter the intended query logic.

Root Cause

The vulnerability stems from improper neutralization of special elements in the code parameter within /borrowedtool.php. The application fails to implement proper input validation, prepared statements, or parameterized queries, allowing attacker-controlled input to be directly interpreted as part of the SQL command structure.

Attack Vector

The attack can be executed remotely over the network. An attacker with low-level privileges can craft malicious requests containing SQL injection payloads in the code parameter. The exploit has been publicly disclosed and may be actively used. The attack requires no user interaction beyond the initial authentication, making it straightforward to exploit once access is obtained.

The injection point in /borrowedtool.php accepts the code argument which, when manipulated with SQL metacharacters and command syntax, allows the attacker to modify the underlying database query. This can result in unauthorized data extraction, modification of existing records, or potential escalation depending on database permissions.

For detailed technical analysis and proof-of-concept information, refer to the GitHub Issue #7 and the VulDB Vulnerability Entry #355661.

Detection Methods for CVE-2026-5719

Indicators of Compromise

• Unusual SQL syntax patterns in web server access logs targeting /borrowedtool.php
• Error messages in application logs indicating SQL syntax errors or database exceptions
• Unexpected database query patterns or execution times on the backend database server
• Requests to /borrowedtool.php containing special characters such as single quotes, double dashes, or UNION keywords in the code parameter

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests to /borrowedtool.php
• Configure intrusion detection systems (IDS) to alert on suspicious request patterns containing SQL metacharacters targeting the vulnerable endpoint
• Enable detailed application logging and monitor for SQL error messages or anomalous query behavior
• Deploy database activity monitoring to detect unusual query patterns or unauthorized data access attempts

Monitoring Recommendations

• Review web server access logs for requests to /borrowedtool.php with suspicious code parameter values
• Monitor database audit logs for unexpected queries or privilege escalation attempts
• Set up alerting for application errors related to SQL syntax or database connectivity issues
• Implement real-time log correlation to identify potential exploitation attempts across multiple log sources

How to Mitigate CVE-2026-5719

Immediate Actions Required

• Restrict network access to the Construction Management System to trusted IP addresses only
• Implement Web Application Firewall rules to block known SQL injection patterns targeting /borrowedtool.php
• Review application logs for evidence of prior exploitation attempts
• Consider temporarily disabling the /borrowedtool.php functionality until a proper fix can be applied

Patch Information

No official vendor patch has been identified for this vulnerability at the time of publication. Organizations using itsourcecode Construction Management System 1.0 should contact the vendor through IT Source Code for remediation guidance. Security teams should monitor the VulDB entry and GitHub issue for updates on available fixes.

Workarounds

• Implement input validation on the code parameter to allow only expected alphanumeric values
• Modify the application code to use prepared statements or parameterized queries instead of string concatenation
• Deploy a reverse proxy or WAF in front of the application to filter malicious input
• Apply the principle of least privilege to the database account used by the application to limit potential damage from successful exploitation

# Example WAF rule to block SQL injection attempts (ModSecurity format)
SecRule ARGS:code "@rx (?i)(union|select|insert|update|delete|drop|--|;|')" \
    "id:100001,phase:2,deny,status:403,msg:'Potential SQL Injection in code parameter'"