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The vulnerability resides in the GrapesJS builder component of the Mautic marketing automation platform. This component provides a visual editor for creating emails and pages. The feature allowing users to upload media files (e.g., images) for use in their designs lacks proper server-side validation on the file type and content. An attacker with access to the builder (e.g., an editor-level user) can bypass the intended client-side restrictions and upload a file with a malicious extension, such as a `.php` or `.phtml` shell. The uploaded file is typically stored within the web-accessible `/media` directory. If this directory is not configured with the proper security restrictions (like php_admin_flag engine off), the web server will execute the malicious file when its URL is accessed, leading to remote code execution on the underlying server.
Platform: Mautic
Version: 4.0.0-4.4.17
Vulnerability: Unrestricted File Upload
Severity: Critical
Date: 2025-12-02
Prediction: Patch Released 2025-12-02
What Undercode Say:
curl -F “[email protected]” http://target/mautic/grapesjs/media/upload
find /var/www/html -name “.phtml” -newer /tmp/timestamp
echo “” > exploit.phtml
How Exploit:
Attacker uploads web shell. Accesses shell URL. Executes arbitrary commands.
Protection from this CVE:
Update to patched versions. Implement server-side file validation. Harden media directory permissions.
Impact:
Remote Code Execution. Full system compromise.
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Sources:
Reported By: github.com
Extra Source Hub:
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