Critical severity · published Jun 13, 2025
CVE-2025-49596
MCP Inspector proxy server lacks authentication between the Inspector client and proxy
9.4
CVSS
44.5%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)44.5% · higher than 99% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IN
inspector · modelcontextprotocol
< 0.14.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49596
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-49596
github.com
https://github.com/modelcontextprotocol/inspector/commit/50df0e1ec488f3983740b4d28d2a968f12eb8979
github.com
https://github.com/modelcontextprotocol/inspector/security/advisories/GHSA-7f8r-222p-6f5g
thenewstack.io
https://thenewstack.io/mcp-vulnerability-exposes-the-ai-untrusted-code-crisis
www.oligo.security
https://www.oligo.security/blog/critical-rce-vulnerability-in-anthropic-mcp-inspector-cve-2025-49596
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