CVE-2026-46339: Command Injection (CVSS 10)

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.

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CVSS v3.1 Score

10.0

CRITICAL

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

EPSS — Exploit Prediction

0.0457

Probability of exploitation

0.91%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-78 OS Command Injection

CWE-306 Missing Authentication

References

Other References

https://github.com/decolua/9router/commit/992f4db4a0d858bcc86b4786f2abab117a6ccdf8 https://github.com/decolua/9router/security/advisories/GHSA-fhh6-4qxv-rpqj https://github.com/decolua/9router/security/advisories/GHSA-fhh6-4qxv-rpqj

Frequently Asked Questions

What is CVE-2026-46339? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2026-46339? +

CVE-2026-46339 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0457, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-46339? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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