{"id":"CVE-2026-62312","aliases":["EUVD-2026-44814","GHSA-63p9-g54h-prrp"],"status":"published","title":"9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments","description":"9Router is an AI router \u0026 token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00924,"percentile":0.60679,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2026-07-15T20:53:18Z","modified":"2026-10-28T02:30:42Z","products":[{"vendor":"decolua","product":"9router"}],"references":[{"url":"https://github.com/decolua/9router/security/advisories/GHSA-63p9-g54h-prrp","tags":["x_refsource_CONFIRM","exploit","advisory"]},{"url":"https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/decolua/9router/releases/tag/v0.5.2","tags":["x_refsource_MISC","web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62312.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62312","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-62312","title":"9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments","description":"9Router is an AI router \u0026 token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.","status":"published","published":"2026-07-15T20:53:18.302Z","modified":"2026-07-16T18:51:28.371Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:20:14.999906Z"}],"euvd":[{"id":"EUVD-2026-44814","description":"9Router is an AI router \u0026 token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.","status":"published","published":"2026-07-15T20:53:18Z","modified":"2026-07-16T18:51:28Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:19:51.364603Z"}],"nvd":[{"id":"CVE-2026-62312","description":"9Router is an AI router \u0026 token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.","status":"published","published":"2026-07-15T21:16:55.81Z","modified":"2026-10-24T21:10:00.13Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:12:30.250437Z"}],"osv":[{"id":"CVE-2026-62312","title":"9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments","description":"9Router is an AI router \u0026 token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.","status":"published","published":"2026-07-15T20:53:18.302Z","modified":"2026-10-28T02:30:42.234250222Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T15:45:13.306117Z"}]}}