CVE-2025-53967 is a critical remote code execution (RCE) vulnerability affecting Framelink Figma MCP Server versions prior to 0.6.3. The vulnerability stems from improper sanitization of user-supplied input in an HTTP POST request processed by the MCP Server. Specifically, the input is incorporated into a fetchWithRetry curl command without adequate escaping or validation, allowing attackers to inject shell metacharacters and arbitrary commands. Since the MCP Server executes these commands with its own process privileges, an attacker can gain control over the underlying operating system environment. The attack vector requires network access to the MCP interface but does not require authentication or user interaction, significantly lowering the barrier to exploitation. The vulnerability was publicly disclosed on October 8, 2025, with no CVSS score assigned yet and no known exploits detected in the wild. The lack of input sanitization in a critical network-facing component makes this a severe threat, especially in environments where the MCP Server is exposed or insufficiently segmented. The vulnerability can lead to full system compromise, data theft, service disruption, or lateral movement within a network.

For European organizations, exploitation of CVE-2025-53967 could result in complete compromise of affected MCP Server hosts. This could lead to unauthorized access to sensitive design and project data managed by the Figma MCP Server, disruption of design workflows, and potential lateral movement to other internal systems. Organizations in sectors with high reliance on collaborative design tools, such as technology, manufacturing, and creative industries, may face significant operational and reputational damage. The ability to execute arbitrary OS commands without authentication increases the risk of ransomware deployment, data exfiltration, and persistent backdoors. Given the MCP Server’s role in managing design collaboration, compromise could also impact intellectual property confidentiality. The threat is exacerbated if the MCP interface is exposed to untrusted networks or insufficiently protected by network segmentation and access controls.

1. Immediately upgrade all Framelink Figma MCP Server instances to version 0.6.3 or later, where this vulnerability is patched. 2. Restrict network access to the MCP interface using firewalls or network segmentation to limit exposure only to trusted internal hosts. 3. Implement strict input validation and sanitization on any user-supplied data processed by the MCP Server, especially those used in shell commands. 4. Monitor network traffic and server logs for unusual POST requests containing suspicious shell metacharacters or command injection patterns. 5. Employ host-based intrusion detection systems (HIDS) to detect anomalous command execution or process behavior on MCP Server hosts. 6. Conduct regular vulnerability scans and penetration tests focusing on the MCP Server to identify any residual or related weaknesses. 7. Develop and test incident response plans specific to MCP Server compromise scenarios to enable rapid containment and recovery.