TC-2026-0051 · MCP · MCP

[email protected]

Remote streamable-http MCP server listed in registry metadata without packages[]; mutated its /.well-known/oauth-protected-resource scopes from read:jira-work to admin:org without version bump.

Primary advisory (threat.cafe Remote MCP CT-Log) Back to all 66 records

Signed ledger verdict

TC-2026-0051
Known bad (exit 2) mcp:[email protected]

IOC & scope: mcp:[email protected] (DRIFT_02 OAuth Scope Escalation). Verified by human review and signed into the CC-BY 4.0 OSV v1.6.0 feed.

Credited finder
threat.cafe Remote MCP CT-Log ↗
Recorded timestamp
2026-10-20
Canonical SHA-256
44caf1beeb37f251…
Local hook action
Block (exit 2)
Run live in Counter Workbench

Signed in /feed.json (.sig).

01 8-Vector Capability X-Ray (ABOM) & OWASP Agentic Crosswalk

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. 1. Filesystem
    Sensitive paths touched: None observed
  2. 2. Environment
    Variables harvested: None observed
  3. 3. Network
    Outbound egress domains: streamable-http remote endpoint
  4. 4. Subprocess
    Process execution primitives: None observed
  5. 5. Lifecycle
    Install / startup hooks: None observed
  6. 6. OAuth / MCP
    Declared scopes: read:jira-work -> escalated to admin:org, write:jira-work
  7. 7. Obfuscation
    Encoding / steganography: None observed
  8. 8. Provenance
    Attestation status: remote_only_unpinned_endpoint

Governance & detector mapping

  1. OWASP Agentic ASI (2026): ASI03 (Identity & Privilege Abuse), ASI04 (Agentic Supply Chain Vulnerabilities)
  2. OWASP Agentic AST (2026): AST03 (Insecure Credential Handling), AST04 (Covert Channel Exfiltration)
  3. Deterministic rules matched: DRIFT_01_TOOLS_LIST_MUTATION, DRIFT_02_OAUTH_SCOPE_ESCALATION

Version scoping & related records

  • No other versions of this package are currently listed on the board. Unlisted versions evaluate to unknown under local policy.yml.

Local CLI verification

$ threat-cafe-hook check "mcp:[email protected]"
[threat.cafe] known_bad: mcp:[email protected] (TC-2026-0051)
  Reason: Remote streamable-http MCP server listed in registry metadata without packages[]; mutated 
  Source: https://registry.modelcontextprotocol.io/v0/servers (credited to threat.cafe Remote MCP CT-Log)

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-2026-0051",
  "modified": "2026-10-20T06:00:00Z",
  "published": "2026-10-20T06:00:00Z",
  "summary": "Remote streamable-http MCP server listed in registry metadata without packages[]; mutated its /.well-known/oauth-protected-resource scopes from read:jira-work to admin:org without version bump.",
  "affected": [
    {
      "package": {
        "ecosystem": "mcp",
        "name": "remote-sse-rugpull-demo"
      },
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "credits": [
    {
      "name": "threat.cafe Remote MCP CT-Log",
      "type": "FINDER"
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://registry.modelcontextprotocol.io/v0/servers"
    },
    {
      "type": "WEB",
      "url": "https://threat.cafe/incidents/tc-2026-0051/"
    }
  ],
  "database_specific": {
    "target": "mcp:[email protected]",
    "kind": "mcp",
    "verdict": "known_bad",
    "ioc": "mcp:[email protected] (DRIFT_02 OAuth Scope Escalation)",
    "artifact_sha256": "44caf1beeb37f2519553ba7fda7af367c995a46dfae4fc142c5f436a0f80be13",
    "owasp_asi": [
      "ASI03",
      "ASI04"
    ],
    "owasp_ast": [
      "AST03",
      "AST04"
    ],
    "rules_matched": [
      "DRIFT_01_TOOLS_LIST_MUTATION",
      "DRIFT_02_OAUTH_SCOPE_ESCALATION"
    ],
    "abom": {
      "fs_sensitive": [],
      "env_harvest": [],
      "net_egress": [
        "streamable-http remote endpoint"
      ],
      "proc_exec": [],
      "install_hooks": [],
      "oauth_scopes": [
        "read:jira-work -> escalated to admin:org, write:jira-work"
      ],
      "obfuscation": [],
      "provenance": "remote_only_unpinned_endpoint"
    },
    "license": "CC-BY-4.0",
    "record_digest": "sha256:4dc01d605d1c90451808004dcc2836e97b456221b3b862ccc40f8018a81eb297",
    "release_signature_url": "https://threat.cafe/feed.json.sig"
  }
}

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