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.
9Router References: https://github.com/decolua/9router/security/advisories/GHSA-fhh6-4qxv-rpqj https://nvd.nist.gov/vuln/detail/CVE-2026-46339 Remediation: Upgrade to 9Router 0.4.37 or later.
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