Attack Chain

1. An attacker identifies an instance of notes-mcp running version 0.1.4 or earlier.
2. The attacker crafts a malicious HTTP request targeting the vulnerable endpoint in notes_mcp.py.
3. The crafted request includes a manipulated root_dir/path argument containing path traversal sequences (e.g., ../) to navigate outside the intended directory.
4. The application fails to properly sanitize or validate the root_dir/path argument.
5. The application uses the attacker-controlled path to access files or directories on the server’s file system.
6. The attacker retrieves sensitive data, such as configuration files, application source code, or user data, by reading arbitrary files on the server.
7. If write access is possible, the attacker may overwrite critical system files.
8. The attacker uses the exposed information to further compromise the system or gain unauthorized access to other resources.

Impact

Successful exploitation of this path traversal vulnerability can lead to unauthorized access to sensitive files and directories on the affected server. This could result in the disclosure of confidential data, such as user credentials, application source code, or internal configuration details. The vulnerability has a CVSS v3.1 score of 7.3 (HIGH), indicating a significant risk. The number of potential victims is unknown, but any system running the vulnerable version of notes-mcp is at risk. The project’s lack of response to the vulnerability report suggests that a patch may not be immediately available, increasing the window of opportunity for attackers.

Recommendation

• Inspect web server access logs for suspicious requests containing path traversal sequences like ../ in the URI targeting notes_mcp.py to identify potential exploitation attempts (see Sigma rule Detect notes-mcp Path Traversal Attempt).
• Deploy the provided Sigma rules to your SIEM to detect exploitation attempts targeting this vulnerability.
• Monitor network traffic for unusual file access patterns originating from the affected server after potential exploitation.
• Since a public exploit is available, prioritize patching or mitigating this vulnerability if you are using the affected software, paying close attention to changes in request patterns and ensuring awareness of CVE-2026-7212.