decolua 9router up to 0.4.36 Middleware src/proxy.js improper authentication

Summaryinfo

A vulnerability classified as very critical was found in decolua 9router up to 0.4.36. This affects an unknown part of the file src/proxy.js of the component Middleware. Executing a manipulation can lead to improper authentication. The identification of this vulnerability is CVE-2026-46339. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as very critical was found in decolua 9router up to 0.4.36. This vulnerability affects an unknown function of the file src/proxy.js of the component Middleware. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

9Router is an AI router & token saver. From 0.4.30 until 0.4.37, 9Router's src/proxy.js middleware did not protect /api/cli-tools/* and /api/mcp/*, allowing unauthenticated registration of customPlugins through src/app/api/cli-tools/cowork-settings/route.js and command execution through the MCP bridge. This vulnerability is fixed in 0.4.37.

The advisory is available at github.com. This vulnerability was named CVE-2026-46339 since 05/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/15/2026).

Upgrading to version 0.4.37 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• decolua

Name

• 9router

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10
• 0.4.11
• 0.4.12
• 0.4.13
• 0.4.14
• 0.4.15
• 0.4.16
• 0.4.17
• 0.4.18
• 0.4.19
• 0.4.20
• 0.4.21
• 0.4.22
• 0.4.23
• 0.4.24
• 0.4.25
• 0.4.26
• 0.4.27
• 0.4.28
• 0.4.29
• 0.4.30
• 0.4.31
• 0.4.32
• 0.4.33
• 0.4.34
• 0.4.35
• 0.4.36

Website

• Product: https://github.com/decolua/9router/

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