CVE-2026-3793
📋 TL;DR
This SQL injection vulnerability in SourceCodester Sales and Inventory System 1.0 allows attackers to manipulate database queries through the 'sellid' parameter in sales_invoice1.php. Attackers can potentially read, modify, or delete database contents remotely. Organizations using this specific software version are affected.
💻 Affected Systems
- SourceCodester Sales and Inventory System
📦 What is this software?
Sales And Inventory System by Ahsanriaz26gmailcom
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including theft of sensitive sales/inventory data, customer information, financial records, and potential system takeover via privilege escalation.
Likely Case
Data exfiltration of sales and inventory information, potential modification of pricing or stock levels, and unauthorized access to business data.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only allowing data viewing without modification.
🎯 Exploit Status
Public proof-of-concept available on GitHub, simple SQL injection via GET parameter manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.sourcecodester.com/
Restart Required: No
Instructions:
No official patch available. Consider implementing input validation and parameterized queries in sales_invoice1.php.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection patterns targeting the sellid parameter
Input Validation Filter
allAdd server-side validation to only accept numeric values for sellid parameter
Add PHP validation: if(!is_numeric($_GET['sellid'])) { die('Invalid input'); }
🧯 If You Can't Patch
- Restrict network access to only trusted IP addresses
- Implement database user with minimal required permissions (read-only if possible)
🔍 How to Verify
Check if Vulnerable:
Test sales_invoice1.php with SQL injection payloads in sellid parameter (e.g., sales_invoice1.php?sellid=1' OR '1'='1)Check Version:
Check software version in admin panel or readme filesVerify Fix Applied:
Test with same payloads after implementing fixes - should return error or no SQL execution📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in web server logs
- Multiple requests to sales_invoice1.php with special characters in sellid parameter
- Database queries with UNION, SELECT, or other SQL keywords from web requests
Network Indicators:
- HTTP requests containing SQL keywords in GET parameters
- Unusual database connection patterns from web server
SIEM Query:
web.url:*sales_invoice1.php* AND (web.param.sellid:*'* OR web.param.sellid:*UNION* OR web.param.sellid:*SELECT*)