CVE-2026-46339

Deferred Deferred - Pending Action

Remote Code Execution in 9Router AI Router

Publication date: 2026-07-15

Last updated on: 2026-07-16

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-15

Last Modified

2026-07-16

Generated

2026-08-05

AI Q&A

2026-07-16

EPSS Evaluated

2026-08-03

NVD

CVE-2026-46339

Affected Vendors & Products

Vendor	Product	Version / Range
9router	9router	From 0.4.30 (inc) to 0.4.37 (exc)
9router	9router	0.4.37

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
CWE-78	The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Attack-Flow Graph

Executive Summary

This vulnerability affects 9Router versions 0.4.30 to 0.4.37. The src/proxy.js middleware fails to protect /api/cli-tools/* and /api/mcp/* endpoints. Unauthenticated users can register customPlugins via src/app/api/cli-tools/cowork-settings/route.js and execute commands through the MCP bridge.

Detection Guidance

Check if your 9Router version is between 0.4.30 and 0.4.37. Inspect network traffic for unauthorized access to /api/cli-tools/* or /api/mcp/*. Look for unexpected plugin registrations or command executions.

Impact Analysis

An attacker could exploit this to register malicious plugins or execute arbitrary commands on the router without authentication. This could lead to unauthorized access, data theft, or control over the device and network traffic.

Compliance Impact

This vulnerability could violate GDPR by enabling unauthorized access to personal data processed by the router. For HIPAA, it may compromise protected health information if the router handles such data. Compliance depends on the router's role in data processing.

Mitigation Strategies

Upgrade 9Router to version 0.4.37 or later immediately. Block external access to /api/cli-tools/* and /api/mcp/* endpoints if possible. Review system logs for signs of exploitation.

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