CVE-2025-49596
MCP Inspector proxy server lacks authentication between the Inspector client and proxy
- Published
- Jun 13, 2025
- Updated
- Jul 9, 2025
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XModerate · next 30 days
- Percentile
- 98.7%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
2- MCP-Inspector-CVE-2025-49596Scanner
MCP-Inspector-vulncheck is a Python script that checks if an MCP Inspector server is vulnerable to CVE-2025-49596. It tests whether the /sse endpoint responds to unauthenticated requests, indicating a potential security flaw. The script is simple to use and provides clear output on whether the target server is likely vulnerable or patched.
- CVE-2025-49596-PoCExploit
PoC for CVE-2025-49596 on linux targets
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.