CVE-2025-15061: Framelink Figma MCP Server RCE Flaw

CVE-2025-15061 Overview

CVE-2025-15061 is a critical command injection vulnerability affecting the Framelink Figma MCP Server. This vulnerability allows remote attackers to execute arbitrary code on affected installations without requiring authentication. The flaw exists within the implementation of the fetchWithRetry method, where improper validation of user-supplied strings before using them to execute system calls enables attackers to inject and execute malicious commands in the context of the service account.

Critical Impact

Unauthenticated remote attackers can achieve full code execution on vulnerable Framelink Figma MCP Server installations, potentially compromising the entire system and any connected resources.

Affected Products

• Framelink Figma MCP Server (vulnerable versions prior to patch)
• Figma-Context-MCP implementations utilizing the fetchWithRetry method

Discovery Timeline

• 2026-01-23 - CVE-2025-15061 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2025-15061

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The fetchWithRetry method in Framelink Figma MCP Server fails to properly sanitize user-controlled input before incorporating it into system calls. This lack of input validation creates a direct pathway for attackers to inject arbitrary operating system commands that execute with the privileges of the service account running the MCP Server.

The vulnerability is particularly dangerous because it requires no authentication to exploit. Remote attackers can craft malicious requests that, when processed by the fetchWithRetry method, result in the execution of attacker-controlled commands on the underlying system. This could lead to complete system compromise, data exfiltration, lateral movement within the network, or deployment of persistent backdoors.

Root Cause

The root cause of CVE-2025-15061 lies in insufficient input validation within the fetchWithRetry method implementation. User-supplied data is passed directly to system execution functions without proper sanitization or escaping of shell metacharacters. This allows attackers to break out of the intended command context and inject their own commands using shell metacharacters such as semicolons, pipes, backticks, or command substitution syntax.

Attack Vector

The attack vector is network-based, requiring no user interaction or prior authentication. An attacker can exploit this vulnerability by sending specially crafted requests to the Framelink Figma MCP Server that include malicious payloads in parameters processed by the fetchWithRetry method. The malicious input is then passed unsanitized to system execution functions, resulting in arbitrary command execution.

For example, an attacker could inject shell metacharacters followed by malicious commands that would be executed by the underlying operating system. The injected commands execute with the same privileges as the MCP Server service account, potentially providing significant access to the compromised system.

For detailed technical information about the exploitation mechanism, refer to the GitHub Security Advisory and Zero Day Initiative Advisory ZDI-25-1197.

Detection Methods for CVE-2025-15061

Indicators of Compromise

• Unusual child processes spawned by the Figma MCP Server process
• Unexpected outbound network connections from the server to unknown external IP addresses
• Shell command execution patterns in application logs containing metacharacters like ;, |, &&, or backticks
• Presence of new user accounts, scheduled tasks, or persistence mechanisms created by the service account

Detection Strategies

• Monitor application and system logs for command injection patterns in requests to the MCP Server
• Implement Web Application Firewall (WAF) rules to detect and block requests containing common shell metacharacters and command injection payloads
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process execution chains originating from the MCP Server service
• Configure SIEM alerts for patterns indicative of command injection attempts against Figma MCP Server endpoints

Monitoring Recommendations

• Enable verbose logging for the Framelink Figma MCP Server and forward logs to a centralized SIEM
• Monitor process creation events on servers hosting the MCP Server for unexpected command-line arguments
• Track network connections initiated by the MCP Server process for unusual destinations or protocols
• Implement file integrity monitoring on critical system directories to detect unauthorized modifications

How to Mitigate CVE-2025-15061

Immediate Actions Required

• Update Framelink Figma MCP Server to the latest patched version immediately
• If patching is not immediately possible, restrict network access to the MCP Server to trusted sources only
• Implement network segmentation to limit the blast radius of potential compromise
• Review system and application logs for any signs of prior exploitation

Patch Information

Security patches addressing this command injection vulnerability are tracked in the GitHub Security Advisory GHSA-gxw4-4fc5-9gr5. Organizations should review this advisory for specific version information and upgrade instructions. Additional details about the vulnerability disclosure are available through the Zero Day Initiative Advisory ZDI-25-1197.

Workarounds

• Implement strict network access controls to limit which hosts can communicate with the MCP Server
• Deploy a reverse proxy or WAF in front of the MCP Server configured to filter and block requests containing shell metacharacters
• Run the MCP Server with minimal privileges using a dedicated service account with restricted system access
• Consider temporarily disabling the affected service if it is not business-critical until patching can be completed

# Example: Restrict network access to MCP Server using iptables
# Allow only trusted IP ranges to access the MCP Server port
iptables -A INPUT -p tcp --dport 3000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP