Executive Summary

This vulnerability exists in the getsimpletool mcpo-simple-server up to version 0.2.0, specifically in the function delete_shared_prompt located in the file src/mcpo_simple_server/services/prompt_manager/base_manager.py.

The issue is caused by improper handling of the argument 'detail', which allows for relative path traversal. This means an attacker can manipulate the input to access files or directories outside the intended scope.

The attack can be initiated remotely, and the exploit code has been publicly released, increasing the risk of exploitation.

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Impact Analysis

Exploitation of this vulnerability can allow an attacker to access or manipulate files outside the intended directory structure on the affected server.

This can lead to unauthorized disclosure of sensitive information, modification or deletion of important files, and potentially further compromise of the system.

Since the attack can be performed remotely without authentication, it poses a significant security risk.

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Executive Summary

CVE-2026-7404 is a Path Traversal vulnerability in the getsimpletool mcpo-simple-server, specifically in the delete_shared_prompt function. The vulnerability occurs because the server uses attacker-controlled input in filesystem paths without proper validation or canonicalization. This allows an attacker to manipulate the input to traverse directories outside the intended scope, potentially accessing, modifying, or deleting arbitrary files on the server.

The issue arises from the lack of checks to prevent traversal sequences like '../' or absolute paths, enabling attackers to escape the designated directory boundaries. The vulnerability can be exploited remotely without authentication by sending a malicious detail parameter to the delete_shared_prompt function.

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Impact Analysis

This vulnerability can have serious impacts including unauthorized access to sensitive files, modification or deletion of important data, and potential disruption of service if critical files are affected.

• Confidentiality impact: Sensitive files could be exposed to unauthorized users.
• Integrity impact: Attackers could alter or delete files, compromising data integrity.
• Availability impact: Deletion or modification of critical files could disrupt the availability of the service.

The vulnerability has a high severity score (CVSS v3.1 suggested as 9.8) due to the potential for full filesystem compromise.

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Detection Guidance

This vulnerability can be detected by monitoring for attempts to invoke the delete_shared_prompt function with path traversal payloads in the detail parameter, such as sequences containing '../' or absolute paths that escape the intended directory.

Since the vulnerability involves filesystem path manipulation, detection can include searching server logs or network traffic for suspicious requests targeting the delete_shared_prompt endpoint with traversal patterns.

A practical approach is to use command-line tools to scan logs or live traffic for these patterns. For example, using grep to find suspicious requests in server logs:

• grep -r "delete_shared_prompt" /path/to/logs | grep "\.\./"
• tcpdump or Wireshark filters to capture HTTP requests containing '../' in parameters.

Additionally, static code analysis tools like CodeQL can be used to audit the source code for unsafe path handling, as was done to discover this vulnerability.

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Mitigation Strategies

Immediate mitigation steps include restricting filesystem operations to an allowlisted root directory and enforcing strict validation of input paths to reject traversal tokens like '../'.

Canonicalizing paths before any filesystem operation is critical to ensure that paths do not escape the intended directory boundaries.

Replacing free-form path inputs with structured identifiers can reduce the risk of injection of malicious paths.

Until an official fix is released, monitoring and blocking suspicious requests targeting the vulnerable function can help reduce exposure.

Adding regression tests for traversal payloads in the development process is recommended to prevent reintroduction of the vulnerability.

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Compliance Impact

The vulnerability allows remote attackers to perform relative path traversal, potentially leading to unauthorized access, modification, or deletion of sensitive files. This can compromise the confidentiality, integrity, and availability of data.

Such unauthorized access and manipulation of sensitive data could lead to non-compliance with data protection regulations and standards like GDPR and HIPAA, which require strict controls over access to personal and sensitive information.

Specifically, the exposure or alteration of sensitive files due to this vulnerability could result in breaches of confidentiality and integrity requirements mandated by these regulations.

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Detection Guidance

This vulnerability can be detected by monitoring for attempts to invoke the delete_shared_prompt function with malicious path traversal payloads in the detail parameter, such as sequences containing '../' or absolute paths.

Since the vulnerability involves filesystem path manipulation, detection can include checking logs or network traffic for suspicious requests targeting the vulnerable endpoint with traversal patterns.

No specific detection commands are provided, but general approaches include:

• Using network monitoring tools (e.g., tcpdump, Wireshark) to capture and analyze requests containing suspicious path traversal strings.
• Searching server logs for requests to delete_shared_prompt with parameters containing '../' or absolute paths.
• On the server, using commands like `grep -r "../" /path/to/logs` to find potential traversal attempts in logs.

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Mitigation Strategies

Immediate mitigation steps include restricting filesystem operations to an allowlisted root directory and enforcing strict validation of input paths.

Specifically, you should:

• Implement canonicalization of file paths before any filesystem operation to prevent traversal sequences from escaping intended directories.
• Reject or sanitize any input containing path traversal tokens such as '../' or absolute paths.
• Replace free-form path inputs with structured identifiers that map to safe locations.
• If possible, restrict network access to the vulnerable endpoint to trusted users or networks.

Since no official fix is available yet, these mitigations can reduce the risk of exploitation.

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