CVE-2026-4825: Sales and Inventory System SQLi Flaw

CVE-2026-4825 Overview

A SQL Injection vulnerability has been identified in SourceCodester Sales and Inventory System version 1.0. This vulnerability exists in the /update_sales.php file within the HTTP GET Parameter Handler component. An attacker can exploit this flaw by manipulating the sid parameter to inject arbitrary SQL commands, potentially compromising database integrity and confidentiality. The vulnerability can be exploited remotely, and a public exploit is available.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to extract sensitive data, modify database contents, or potentially escalate to further system compromise through malicious SQL query injection via the sid parameter.

Affected Products

• SourceCodester Sales and Inventory System 1.0
• HTTP GET Parameter Handler component (/update_sales.php)
• Systems running vulnerable PHP/MySQL configurations with this application

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-4825 published to NVD
• 2026-03-25 - Last updated in NVD database

Technical Details for CVE-2026-4825

Vulnerability Analysis

This vulnerability is classified as an injection flaw (CWE-74), specifically manifesting as SQL Injection in the update_sales.php endpoint. The vulnerable component fails to properly sanitize or parameterize user-supplied input through the sid HTTP GET parameter before incorporating it into SQL queries. This allows attackers to break out of the intended query structure and inject malicious SQL statements.

The network-accessible attack vector means remote exploitation is possible without requiring physical access. The vulnerability requires low privileges to exploit, making it accessible to authenticated users of the system. The impact includes potential compromise of data confidentiality, integrity, and availability within the scope of the database connection.

Root Cause

The root cause of this vulnerability is improper input validation and the absence of parameterized queries or prepared statements in the /update_sales.php file. When processing the sid parameter from HTTP GET requests, the application directly concatenates user input into SQL query strings without adequate sanitization. This classic injection flaw allows attackers to manipulate the SQL logic by crafting malicious input values.

Attack Vector

The attack is launched remotely over the network by sending specially crafted HTTP GET requests to the /update_sales.php endpoint. The attacker manipulates the sid parameter value to include SQL syntax that alters the query's behavior. Common exploitation techniques include:

• Using single quotes or other SQL escape characters to break out of string contexts
• Appending UNION SELECT statements to extract data from other tables
• Injecting boolean-based or time-based blind SQL injection payloads
• Leveraging stacked queries to perform data modification operations

Technical details and proof-of-concept information are available in the GitHub SQL Injection PoC repository.

Detection Methods for CVE-2026-4825

Indicators of Compromise

• HTTP GET requests to /update_sales.php containing SQL metacharacters (single quotes, semicolons, UNION keywords) in the sid parameter
• Unusual database error messages in application logs indicating malformed SQL queries
• Unexpected database queries or data exfiltration attempts in database audit logs
• Anomalous outbound network traffic if data is being exfiltrated

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the sid parameter
• Implement database activity monitoring to identify unusual query patterns or unauthorized data access
• Configure application logging to capture all requests to /update_sales.php with parameter values
• Enable SQL query logging on the database server to detect injected malicious statements

Monitoring Recommendations

• Monitor HTTP access logs for requests to /update_sales.php with encoded or suspicious parameter values
• Set up alerts for database errors related to SQL syntax in the Sales and Inventory System database
• Review database audit logs regularly for unauthorized SELECT, UPDATE, or DELETE operations
• Implement real-time alerting for multiple failed SQL queries that may indicate injection attempts

How to Mitigate CVE-2026-4825

Immediate Actions Required

• Restrict access to /update_sales.php through network segmentation or access controls until a patch is applied
• Implement input validation on the sid parameter to accept only numeric values
• Deploy Web Application Firewall rules to block SQL injection payloads targeting this endpoint
• Review database user permissions and apply principle of least privilege

Patch Information

No official vendor patch has been announced for this vulnerability at the time of publication. Organizations using SourceCodester Sales and Inventory System 1.0 should monitor the SourceCodester website for security updates. Additional vulnerability details are available through VulDB #353125.

Workarounds

• Implement server-side input validation to reject any non-numeric values for the sid parameter
• Modify the source code to use prepared statements or parameterized queries for all database operations involving user input
• Deploy a reverse proxy or WAF with SQL injection protection in front of the application
• Consider disabling or restricting access to the vulnerable endpoint if the functionality is not critical

# Example Apache mod_rewrite rule to block SQL injection patterns
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} ^.*(\%27|\'|union|select|insert|drop|delete|update|;|--) [NC]
RewriteRule ^update_sales\.php$ - [F,L]