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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-46339
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 21:16:50 UTC
Updated2026-07-16 14:16:52 UTC
Description9Router 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.

Risk And Classification

Primary CVSS: v3.1 10 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.045720000 probability, percentile 0.905810000 (date 2026-07-20)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decolua 9router affected >= 0.4.30, < 0.4.37 Not specified

References

ReferenceSourceLinkTags
github.com/decolua/9router/security/advisories/GHSA-fhh6-4qxv-rpqj 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/decolua/9router/commit/992f4db4a0d858bcc86b4786f2abab117a6ccdf8 [email protected] github.com
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