CVE-2026-21449
📋 TL;DR
Bagisto eCommerce platform versions before 2.3.10 are vulnerable to server-side template injection (SSTI) through first name and last name fields. This allows low-privilege users to execute arbitrary code on the server. All Bagisto installations using vulnerable versions are affected.
💻 Affected Systems
- Bagisto
📦 What is this software?
Bagisto by Webkul
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise leading to data theft, ransomware deployment, or complete system takeover
Likely Case
Privilege escalation to admin, data exfiltration, or installation of backdoors
If Mitigated
Limited impact if proper input validation and user privilege separation are in place
🎯 Exploit Status
Exploitation requires low-privilege user account; GitHub advisory includes technical details
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.10
Vendor Advisory: https://github.com/bagisto/bagisto/security/advisories/GHSA-mqhg-v22x-pqj8
Restart Required: No
Instructions:
1. Backup your Bagisto installation and database. 2. Update to version 2.3.10 via composer: 'composer require bagisto/bagisto:2.3.10'. 3. Run database migrations if needed: 'php artisan migrate'. 4. Clear cache: 'php artisan cache:clear'.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to reject template injection patterns in user profile fields
Add validation rules to UserController to sanitize first_name and last_name fields
Disable User Registration
allTemporarily disable new user registration to prevent exploitation
Modify config/auth.php to disable registration routes
🧯 If You Can't Patch
- Implement WAF rules to block template injection patterns in POST requests
- Restrict user registration to trusted IP addresses only
🔍 How to Verify
Check if Vulnerable:
Check Bagisto version in composer.json or via 'php artisan --version'Check Version:
grep '"bagisto/bagisto"' composer.json | grep -o '"[0-9.]*"'Verify Fix Applied:
Confirm version is 2.3.10 or higher and test user profile updates with template injection attempts📡 Detection & Monitoring
Log Indicators:
- Unusual template rendering errors
- User profile updates containing {{, {% or other template syntax
- PHP execution from unexpected sources
Network Indicators:
- POST requests to user profile endpoints with template payloads
SIEM Query:
source="web_logs" AND (uri="/customer/account/editPost" OR uri="/admin/customer/*") AND (body CONTAINS "{{.*}}" OR body CONTAINS "{%.*%}")