Attack Chain

1. The attacker identifies an instance of MLOps_MCP version 1.0.0 accessible remotely.
2. The attacker crafts a malicious request targeting the fastmcp_server.py file of the save_file Tool component.
3. Within the request, the attacker manipulates the filename/destination argument to include a path traversal sequence (e.g., ../../).
4. The MLOps_MCP application processes the crafted request without proper validation of the supplied path.
5. The application attempts to save the file to the attacker-specified path, traversing directories outside the intended storage location.
6. Depending on the server’s permissions, the attacker may be able to overwrite existing files or create new files in arbitrary locations.
7. If the attacker overwrites a critical system file, it can lead to denial of service.
8. If the attacker uploads and executes a malicious script, it can lead to complete system compromise.

Impact

Successful exploitation of this path traversal vulnerability (CVE-2026-7213) can lead to unauthorized file access, modification, or creation on the affected system. An attacker could potentially overwrite critical system files, leading to denial-of-service conditions. Furthermore, the attacker might be able to upload and execute malicious scripts, resulting in complete system compromise. The CVSS v3.1 base score of 7.3 indicates a high level of severity.

Recommendation

• Deploy the Sigma rule Detect MLOps_MCP Path Traversal Attempt to your SIEM to detect path traversal attempts targeting fastmcp_server.py based on HTTP request parameters.
• Implement input validation and sanitization measures on the filename/destination argument within the save_file Tool component to prevent path traversal attacks.
• Monitor web server logs for suspicious requests containing path traversal sequences (e.g., ../, ..\\) as detected by the Detect Web Server Path Traversal rule.