CVE-2026-26029 is an OS command injection vulnerability identified in the sf-mcp-server software developed by akutishevsky, which serves as an implementation of the Salesforce MCP server for Claude for Desktop. The vulnerability stems from the unsafe usage of the Node.js child_process.exec function to execute Salesforce CLI commands that incorporate user-controlled input without proper sanitization or neutralization of special shell characters. This improper neutralization (classified as CWE-78) allows an attacker who can influence the input to inject arbitrary shell commands. When exploited, these commands execute with the same privileges as the MCP server process, potentially leading to full system compromise. The vulnerability affects all versions prior to 1.0.3, with the fix presumably included in or after that version. The CVSS v3.1 score is 7.5 (high), reflecting network attack vector, high impact on confidentiality, integrity, and availability, no privileges required, but requiring user interaction. Although no known exploits have been reported in the wild yet, the nature of the vulnerability makes it a critical risk for affected deployments. The vulnerability is particularly dangerous because it allows execution of arbitrary commands, which can lead to data theft, system manipulation, or denial of service. The root cause is the failure to properly sanitize or escape user input before passing it to a shell command execution function, a common and well-understood security flaw in software development.

The impact of CVE-2026-26029 is significant for organizations using the sf-mcp-server, especially those integrating Salesforce MCP server functionality with Claude for Desktop. Successful exploitation can lead to arbitrary code execution on the host system with the privileges of the MCP server process, potentially allowing attackers to steal sensitive data, manipulate or delete data, install malware, or disrupt services. Given the high privileges typically associated with server processes, this can result in full system compromise. The vulnerability affects confidentiality, integrity, and availability of the affected systems. Organizations relying on this software for Salesforce integration or automation may face operational disruptions, data breaches, and reputational damage. Since the attack vector is network-based and requires user interaction, phishing or social engineering could be used to trigger exploitation. The absence of known exploits in the wild provides a window for remediation, but the risk remains high due to the ease of exploitation once user interaction occurs.

To mitigate CVE-2026-26029, organizations should immediately upgrade sf-mcp-server to version 1.0.3 or later where the vulnerability is fixed. If upgrading is not immediately possible, implement strict input validation and sanitization to ensure that any user-controlled input passed to child_process.exec or similar functions is properly escaped or rejected if it contains shell metacharacters. Avoid using child_process.exec with untrusted input; prefer safer alternatives such as child_process.spawn with argument arrays that do not invoke a shell. Employ application-layer controls to restrict access to the MCP server interface, including strong authentication and authorization mechanisms to reduce the risk of user interaction by unauthorized actors. Monitor logs for suspicious command execution patterns and implement endpoint detection and response (EDR) tools to detect anomalous process behavior. Conduct security awareness training to reduce the risk of social engineering attacks that could trigger exploitation. Finally, maintain an incident response plan to quickly contain and remediate any exploitation attempts.