modelcontextprotocol inspector up to 0.14.0 missing authentication

Summaryinfo

A vulnerability classified as critical was found in modelcontextprotocol inspector up to 0.14.0. Affected by this issue is some unknown functionality. The manipulation results in missing authentication. This vulnerability is reported as CVE-2025-49596. The attack can be launched remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in modelcontextprotocol inspector up to 0.14.0. It has been classified as very critical. Affected is an unknown function. The manipulation with an unknown input leads to a missing authentication vulnerability. CWE is classifying the issue as CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-49596 since 06/06/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/10/2025).

Upgrading to version 0.14.1 eliminates this vulnerability. Applying the patch 50df0e1ec488f3983740b4d28d2a968f12eb8979 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-20870). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• modelcontextprotocol

Name

• inspector

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14.0

License

• open-source

Website

• Product: https://github.com/modelcontextprotocol/inspector/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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