CVE-2026-46339
9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 CWE-306 |
| Vendor | decolua |
| Product | 9router |
| Published | Jul 15, 2026 |
| Last Updated | Jul 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
decolua / 9router
>= 0.4.30, < 0.4.37