by Kastro
Paper/Archive/CVE-2025-49596

CVE-2025-49596

modelcontextprotocol inspector — MCP Inspector proxy server lacks authentication between the Inspector client and proxy

EPSS 44%CVSS 9.4
critical.is priorityof 100
48
CVSS 9.4 (CNA)9.4 / 10 × 3028.2Not in CISA KEV+300.0EPSS percentile 98.8.988 × 2019.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

The MCP inspector is a developer tool for testing and debugging MCP servers. Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. Users should immediately upgrade to version 0.14.1 or later to address these vulnerabilities.

Affected

ProductAffectedFixed inSource
inspector< 0.14.1–CNA

Scores by source

GitHub_M (CNA)9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/modelcontextprotocol/inspector/security/advisories/GHSA-7f8r-222p-6f5grefgithub.com/modelcontextprotocol/inspector/commit/50df0e1ec488f3983740b4d28d2a968f12eb8979refthenewstack.io/mcp-vulnerability-exposes-the-ai-untrusted-code-crisisrefoligo.security/blog/critical-rce-vulnerability-in-anthropic-mcp-inspector-cve-2025-49596