CVE-2026-46339

Critical

Description

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.

SeverityCritical

CVSS10.0

Exploit probability—

Product9router

PublishedJul 15, 2026

First seenJul 15, 2026

Weakness typeCWE-78OS command injection CWE-306Missing authentication for critical function

How to fix

Update

9router0.4.37 or later

Affected products

Product	Affected versions	Fixed in
9routernpm	0.4.30 ≤ v < 0.4.37	0.4.37

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