TC-2026-0008 · NPM · MCP
@mcpjam/[email protected]
CVE-2026-23744 (CVSS 9.8): binds 0.0.0.0:6274 without authentication token validation, permitting drive-by browser tabs or LAN peers to execute arbitrary STDIO commands.
Signed ledger verdict
TC-2026-0008
Known bad (exit 2)
npm:@mcpjam/[email protected]
IOC & scope: npm:@mcpjam/[email protected] (CVE-2026-23744). Verified by human review and signed into the CC-BY 4.0 OSV v1.6.0 feed.
Run live in Counter Workbench
Signed in /feed.json (.sig).
Deterministic capability profile and taxonomy mapping.
Every artifact in the threat.cafe ledger is profiled across eight execution vectors and mapped to the OWASP Top 10 for Agentic Applications (ASI01-ASI10) and Agentic Skills & Tools (AST01-AST10).
8-Vector Capability X-Ray (ABOM)
-
1. Filesystem
Sensitive paths touched:
None observed -
2. Environment
Variables harvested:
None observed -
3. Network
Outbound egress domains:
0.0.0.0:6274 (unauthenticated listener) -
4. Subprocess
Process execution primitives:
child_process.spawn (arbitrary MCP stdio transport) -
5. Lifecycle
Install / startup hooks:
None observed -
6. OAuth / MCP
Declared scopes:
None observed -
7. Obfuscation
Encoding / steganography:
None observed -
8. Provenance
Attestation status:
vulnerable_release_cve_2026_23744
Governance & detector mapping
- OWASP Agentic ASI (2026): ASI02 (Tool Misuse & Exploitation), ASI05 (Unexpected Code Execution (RCE))
- OWASP Agentic AST (2026): AST02 (Tool & Skill Injection), AST03 (Insecure Credential Handling)
- Deterministic rules matched:
CONFIG_02_LOCALHOST_NO_AUTH
Version scoping & related records
- TC-2026-0109 (npm:@mcpjam/[email protected]): status
no_known_bad— Patched release of MCPJam Inspector binding strictly to 127.0.0.1 with mandatory bearer token authentication.
Local CLI verification
$ threat-cafe-hook check "npm:@mcpjam/[email protected]" [threat.cafe] known_bad: npm:@mcpjam/[email protected] (TC-2026-0008) Reason: CVE-2026-23744 (CVSS 9.8): binds 0.0.0.0:6274 without authentication token validation, per Source: https://nvd.nist.gov/vuln/detail/CVE-2026-23744 (credited to NVD / GitHub Security Advisory)
OSV v1.6.0 machine-readable record
Included in /feed.json under CC-BY 4.0 license and verified by /feed.json.sig.
{
"schema_version": "1.6.0",
"id": "TC-2026-0008",
"modified": "2026-04-11T15:00:00Z",
"published": "2026-04-11T15:00:00Z",
"summary": "CVE-2026-23744 (CVSS 9.8): binds 0.0.0.0:6274 without authentication token validation, permitting drive-by browser tabs or LAN peers to execute arbitrary STDIO commands.",
"affected": [
{
"package": {
"ecosystem": "npm",
"name": "@mcpjam/inspector"
},
"versions": [
"0.4.2"
]
}
],
"credits": [
{
"name": "NVD / GitHub Security Advisory",
"type": "FINDER"
}
],
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23744"
},
{
"type": "WEB",
"url": "https://threat.cafe/incidents/tc-2026-0008/"
}
],
"database_specific": {
"target": "npm:@mcpjam/[email protected]",
"kind": "mcp",
"verdict": "known_bad",
"ioc": "npm:@mcpjam/[email protected] (CVE-2026-23744)",
"artifact_sha256": "e9b46edd64b560763da64740363525e59bbad5dd72e7b3b447c54ffe63a47f7d",
"owasp_asi": [
"ASI02",
"ASI05"
],
"owasp_ast": [
"AST02",
"AST03"
],
"rules_matched": [
"CONFIG_02_LOCALHOST_NO_AUTH"
],
"abom": {
"fs_sensitive": [],
"env_harvest": [],
"net_egress": [
"0.0.0.0:6274 (unauthenticated listener)"
],
"proc_exec": [
"child_process.spawn (arbitrary MCP stdio transport)"
],
"install_hooks": [],
"oauth_scopes": [],
"obfuscation": [],
"provenance": "vulnerable_release_cve_2026_23744"
},
"license": "CC-BY-4.0",
"record_digest": "sha256:13f9008d55329108a915c27fe5800a4f2e83a2ce54d542824c122d58d43b6f4c",
"release_signature_url": "https://threat.cafe/feed.json.sig"
}
}
Have additional IOCs or a maintainer remediation update for TC-2026-0008?
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