Compliance Impact

The vulnerability allows remote attackers to perform path traversal attacks, enabling unauthorized reading and modification of arbitrary files accessible to the server process. This can lead to data exposure, integrity loss, and potential service disruption.

Such unauthorized access and modification of files could result in violations of data protection regulations like GDPR and HIPAA, which require strict controls over the confidentiality, integrity, and availability of sensitive data.

Organizations using the affected software without applying the patch or mitigations risk non-compliance due to potential unauthorized data access and alteration.

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Executive Summary

CVE-2026-7728 is a path traversal vulnerability in the mcp-rtfm project. It occurs because the software constructs filesystem paths by directly using a user-supplied 'docFile' parameter without proper validation or normalization.

This allows an attacker to include sequences like '../' in the 'docFile' argument to escape the intended '.handoff_docs' directory and access or modify arbitrary files on the server.

The vulnerability affects functions such as get_doc_content, read_doc, and update_doc in the MCP Interface, and can be exploited remotely by sending specially crafted requests.

Exploitation can lead to unauthorized reading or modification of files accessible to the server process, potentially exposing sensitive data or disrupting service.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized data exposure, loss of data integrity, and potential disruption of service.

• Confidentiality risks: Attackers can read sensitive files outside the intended directory.
• Integrity risks: Attackers can modify files by exploiting the update_doc function after reading the target file.
• Availability risks: Unauthorized modifications or access could disrupt normal operation of the MCP server.

Because the attack can be launched remotely over the network, it increases the risk of exploitation if the MCP interface is exposed.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual or unexpected filesystem access patterns, especially attempts to access files outside the intended .handoff_docs directory using path traversal sequences like '../'.

Since the vulnerability involves the manipulation of the docFile argument in functions such as get_doc_content, read_doc, and update_doc, you can look for network requests or logs where these functions are called with suspicious docFile values containing traversal sequences.

Suggested commands include searching server logs or network traffic for requests containing '../' or similar path traversal patterns in the docFile parameter.

• Use grep or similar tools to find suspicious docFile usage in logs: grep -r "docFile=.*\.\.\/" /path/to/logs
• Monitor filesystem access for unexpected reads or writes outside the .handoff_docs directory, for example using auditd or inotifywait on Linux.
• Check for network requests invoking get_doc_content, read_doc, or update_doc with suspicious parameters, e.g., using tcpdump or Wireshark filters.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the MCP interface to trusted users only and running the server process with the lowest possible privileges to limit the impact of any exploitation.

Monitor for unexpected filesystem activity that may indicate exploitation attempts.

Apply the available patch that introduces strict validation of the docFile parameter to prevent path traversal by rejecting filenames containing path separators or parent-directory traversal sequences and ensuring file operations are confined to the intended directory.

If patching immediately is not possible, consider implementing network-level controls such as firewall rules to limit access to the vulnerable MCP interface.

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