CVE-2026-21450
📋 TL;DR
Bagisto eCommerce platforms running versions before 2.3.10 are vulnerable to server-side template injection via the type parameter. This allows attackers to execute arbitrary code remotely, potentially compromising the entire server. All Bagisto installations using vulnerable versions are affected.
💻 Affected Systems
- Bagisto
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise with attacker gaining full control over the web server, database access, and ability to pivot to other systems.
Likely Case
Remote code execution leading to data theft, website defacement, or installation of malware/backdoors.
If Mitigated
Limited impact if proper input validation and output encoding are implemented, though template injection could still leak sensitive data.
🎯 Exploit Status
Template injection vulnerabilities are often easily weaponized. The advisory suggests exploitation is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.10
Vendor Advisory: https://github.com/bagisto/bagisto/security/advisories/GHSA-9hvg-qw5q-wqwp
Restart Required: No
Instructions:
1. Backup your current installation. 2. Update Bagisto to version 2.3.10 or later 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 strict input validation for the type parameter to reject malicious template syntax.
Implement validation in relevant controller methods to sanitize type parameter input
🧯 If You Can't Patch
- Implement WAF rules to block template injection patterns in type parameter
- Restrict access to vulnerable endpoints via network ACLs or authentication
🔍 How to Verify
Check if Vulnerable:
Check Bagisto version in composer.json or via 'php artisan --version' command. If version is below 2.3.10, system is vulnerable.Check Version:
php artisan --versionVerify Fix Applied:
Confirm version is 2.3.10 or higher. Test type parameter with template injection payloads to ensure they're rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual template rendering errors
- Suspicious type parameter values containing template syntax
- Unexpected PHP/system command execution
Network Indicators:
- HTTP requests with template injection payloads in type parameter
- Unusual outbound connections from web server
SIEM Query:
web.url:*type=* AND (web.url:*{{* OR web.url:*}}* OR web.url:*${* OR web.url:*%{*)