CVE-2026-15138 in mcp-text-editor
Summary
by MITRE • 07/09/2026
A security vulnerability has been detected in tumf mcp-text-editor up to 1.0.2. This issue affects the function _validate_file_path of the file mcp_text_editor/text_editor.py. Such manipulation of the argument file_path leads to path traversal. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor closed the GitHub issue for this vulnerability without any explanation.
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Analysis
by VulDB Data Team • 07/09/2026
The security vulnerability in tumf mcp-text-editor version 1.0.2 represents a critical path traversal flaw within the _validate_file_path function of the mcp_text_editor/text_editor.py module. This vulnerability arises from insufficient input validation when processing file_path arguments, allowing attackers to manipulate directory traversal sequences that can bypass intended access controls and potentially gain unauthorized access to arbitrary files on the system. The flaw specifically enables attackers to navigate beyond the intended directory boundaries through carefully crafted path manipulation techniques.
This vulnerability operates as a remote code execution vector that can be exploited by sending specially crafted file_path parameters to the affected application. The attack surface is particularly concerning because it allows for arbitrary file access and potentially arbitrary code execution, depending on the system configuration and permissions. Path traversal vulnerabilities of this nature typically leverage sequences such as ../ or ..\ to move up directory trees and access files outside the intended scope. The vulnerability affects the core text editor functionality where file operations are processed, making it a fundamental security issue that could compromise the integrity of the entire application.
The operational impact of this vulnerability extends beyond simple file access violations to potentially enable complete system compromise when combined with other attack vectors. Attackers can leverage this flaw to read sensitive configuration files, access database files, retrieve user credentials, or even execute malicious code if the application has elevated privileges. The public disclosure of exploitation techniques significantly increases the risk profile as malicious actors can readily implement these methods without requiring advanced technical knowledge. This vulnerability directly maps to CWE-22 Path Traversal and aligns with ATT&CK technique T1059 Command and Scripting Interpreter for potential code execution scenarios.
The vendor's response to this vulnerability by closing the GitHub issue without providing any explanation or patch represents a concerning lack of transparency in vulnerability management. This approach leaves users exposed to known exploitation techniques without any remediation path, potentially violating security best practices and industry standards for responsible disclosure. Organizations using this text editor should immediately implement compensating controls such as network segmentation, input validation at multiple layers, and monitoring for suspicious file access patterns. The absence of vendor response also suggests a potential risk of further unpatched vulnerabilities in the software ecosystem.
Recommended mitigations include implementing strict input validation that rejects path traversal sequences, deploying application firewalls with content filtering capabilities, and restricting file system permissions for the text editor application to minimize potential damage from successful exploitation attempts. Organizations should consider migrating to patched versions when available or implementing network-based protections such as web application firewalls to prevent exploitation attempts. Regular security assessments of third-party components and maintaining updated vulnerability databases are essential practices to address similar issues in other software dependencies that may present analogous attack vectors through similar input validation flaws.