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Known CVE

9Router <= 0.4.36 - Unauthenticated RCE

9Router <= 0.4.36 middleware only guards 8 explicitly listed routes, leaving /api/cli-tools/* and /api/mcp/* entirely unauthenticated. An attacker can POST to /api/cli-tools/cowork-settings to register a custom MCP plugin with attacker-controlled command and args stored verbatim into globalThis, then GET /api/mcp/{name}/sse to trigger spawn() with the stored command resulting in unauthenticated remote code execution.

CVE-2026-46339

Critical2026CVSS 10CWE-78

cve2026 · 9router · rce · mcp · unauth · critical

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