CVE
CVE-2026-46339
9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes
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.
Package Versions Affected
Package Version
patch Availability
No items found.
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CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
10
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
C
H
U
-
Related Resources
No items found.
References
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46339.json, https://github.com/decolua/9router/security/advisories/GHSA-fhh6-4qxv-rpqj, https://nvd.nist.gov/vuln/detail/CVE-2026-46339, https://github.com/decolua/9router/commit/992f4db4a0d858bcc86b4786f2abab117a6ccdf8