CVE-2021-47769
📋 TL;DR
CVE-2021-47769 is a persistent cross-site scripting (XSS) vulnerability in Isshue Shopping Cart 3.5 that allows attackers with privileged user accounts to inject malicious scripts into title input fields. When other users view affected pages, these scripts execute in their browsers, potentially enabling session hijacking and phishing attacks. This affects organizations using the vulnerable version of Isshue Shopping Cart software.
💻 Affected Systems
- Isshue Shopping Cart
📦 What is this software?
Isshue by Bdtask
⚠️ Risk & Real-World Impact
Worst Case
Attackers could hijack administrator sessions, steal sensitive data, deploy persistent phishing pages within the application, or gain full control over the shopping cart system.
Likely Case
Privileged users could inject malicious scripts that steal session cookies from other users, leading to account compromise and potential data theft.
If Mitigated
With proper input validation and output encoding, malicious scripts would be neutralized, preventing execution while maintaining application functionality.
🎯 Exploit Status
Exploitation requires authenticated privileged access. Public exploit code demonstrates injection in title fields that executes during preview operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.bdtask.com/multi-store-ecommerce-shopping-cart-software/
Restart Required: No
Instructions:
1. Check vendor website for security updates. 2. If patch available, download and apply according to vendor instructions. 3. Verify fix by testing title field inputs with XSS payloads.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and HTML encoding for all title input fields
Implement input validation in PHP: htmlspecialchars($input, ENT_QUOTES, 'UTF-8')
Content Security Policy
allImplement CSP headers to restrict script execution
Header set Content-Security-Policy "default-src 'self'; script-src 'self'" in .htaccess or server config
🧯 If You Can't Patch
- Restrict privileged user accounts to trusted personnel only
- Implement web application firewall rules to block XSS payloads in title fields
🔍 How to Verify
Check if Vulnerable:
Test title input fields in stock, customer, and invoice modules with XSS payloads like <script>alert('XSS')</script> and check if scripts execute during previewCheck Version:
Check application version in admin panel or via version.php file if presentVerify Fix Applied:
After applying fixes, test with same XSS payloads to confirm scripts are properly sanitized and don't execute📡 Detection & Monitoring
Log Indicators:
- Unusual long title field entries containing script tags or JavaScript code
- Multiple failed login attempts followed by successful privileged access
Network Indicators:
- HTTP requests with script tags in title parameters
- Unusual outbound connections from application server
SIEM Query:
source="web_logs" AND (title_field CONTAINS "<script>" OR title_field CONTAINS "javascript:")