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The CVE-2025-XXXXX vulnerability in MCP Inspector arises due to the lack of authentication between the Inspector client and proxy server. Attackers can send unauthenticated requests directly to the proxy, which processes them without verification. This allows remote execution of arbitrary MCP commands via stdio, as the proxy blindly trusts incoming connections. The vulnerability affects versions below 0.14.1, where the communication channel lacks encryption or validation. Exploiting this flaw grants attackers full control over the MCP Inspector service, enabling them to execute malicious commands on the host system.
DailyCVE Form:
Platform: MCP Inspector
Version: < 0.14.1
Vulnerability: Auth Bypass → RCE
Severity: Critical
Date: Jun 13, 2025
Prediction: Patch by Jun 20, 2025
What Undercode Say:
Check MCP Inspector version mcp-inspector --version Exploit PoC (simulated unauthenticated command) echo "malicious_command" | nc inspector-proxy 8080 Mitigation command (upgrade) pip install --upgrade mcp-inspector==0.14.1
How Exploit:
- Send unauthenticated MCP commands via stdio to the proxy.
- Proxy executes commands without validation.
- Achieve remote code execution on the host.
Protection from this CVE:
- Upgrade to MCP Inspector 0.14.1+.
- Restrict network access to the proxy.
- Implement transport-layer authentication.
Impact:
- Full system compromise via RCE.
- Unauthorized MCP command execution.
- Network pivoting potential.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
