CVE-2026-46339

9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes

State: Published
Severity: 10.0 Critical
Published: Jul 15, 2026
Updated: Jul 16, 2026
Reserved: May 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	10.0 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
9routerdecolua	>= 0.4.30, < 0.4.37Affected

References

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