@sapiom/mcp@0.12.9
Local Sapiom developer MCP server (sapiom-dev) — the unmetered surface for building and operating on Sapiom; today it scaffolds, tests, deploys, and inspects orchestrations. Not the remote Sapiom capability MCP.
AI Security Review
scanned 2mo ago · by lpm-firewall-aiThe credential-forwarding path is reachable from the active entrypoint and destination configuration is not constrained here. The reverse-shell hint is not supported by source: the child process only opens an authentication URL.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
Run the MCP server with cached credentials and an overridden analytics endpoint, then invoke a wrapped tool.
Impact
A configured non-Sapiom analytics endpoint could receive a Sapiom credential and sensitive tool arguments.
Mechanism
Forwards a cached API key and tool arguments to a destination-configurable analytics client.
AI rationale
The credential-forwarding path is reachable from the active entrypoint and destination configuration is not constrained here. The reverse-shell hint is not supported by source: the child process only opens an authentication URL.
Evidence
dist/index.jsdist/analytics.jsdist/register-tool.js
Decision evidence
public snapshotAI called this Suspicious at 90.0% confidence as Dangerous Capability with low false-positive risk.
Evidence for warning
- The active entrypoint passes the cached Sapiom API key into the analytics client at startup.
- The analytics client permits its destination to be overridden through an environment variable.
- Every wrapped MCP tool call sends its full argument object to that analytics client.
Evidence against
- The manifest has no preinstall, install, or postinstall hook.
- The child-process use only launches the browser for an explicit authentication flow; the OAuth callback binds to localhost and checks state.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetwork
HighEntropyStringsUrlStrings
Source & flagged code
5 flaggeddist/auth.jsView file
1import * as http from "node:http";
L2: import * as crypto from "node:crypto";
L3: import { spawn } from "node:child_process";
L4: import { URL, URLSearchParams } from "node:url";
L5: /**
...
L9: * - NEVER a visible console. The previous `execSync('start "" "<url>"')`
L10: * spawned cmd.exe, which pops a console window on the user's screen when
L11: * the caller isn't attached to one (an MCP server child of a GUI app
...
L16: * a cmd.exe command line treats as a command separator unless quoted
L17: * exactly right. The PowerShell command is passed BASE64-ENCODED
L18: * (-EncodedCommand), so no shell ever tokenizes the URL; the
...
L21: *
Critical
Reverse Shell
Source matches reverse-shell style process and socket wiring.
dist/auth.jsView on unpkg · L11Trigger-reachable chain: manifest.exports -> dist/auth-api.d.ts -> dist/auth.js
L1: import * as http from "node:http";
L2: import * as crypto from "node:crypto";
L3: import { spawn } from "node:child_process";
L4: import { URL, URLSearchParams } from "node:url";
L5: /**
...
L9: * - NEVER a visible console. The previous `execSync('start "" "<url>"')`
L10: * spawned cmd.exe, which pops a console window on the user's screen when
L11: * the caller isn't attached to one (an MCP server child of a GUI app
...
L16: * a cmd.exe command line treats as a command separator unless quoted
L17: * exactly right. The PowerShell command is passed BASE64-ENCODED
L18: * (-EncodedCommand), so no shell ever tokenizes the URL; the
...
L21: *
Critical
Trigger Reachable Dangerous Capability
A package entrypoint or install-time lifecycle script reaches a source file with blocking dangerous behavior.
Findings
3 Critical2 High3 Medium4 Low
CriticalReverse Shelldist/auth.js
CriticalTrigger Reachable Dangerous Capabilitydist/auth.js
CriticalPrevious Version Dangerous Deltadist/auth.js
HighChild Processdist/auth.js
HighSandbox Evasion Gated Capabilitydist/auth.js
MediumNetwork
MediumEnvironment Vars
MediumStructural Risk Force Deep Review
LowScripts Present
LowFilesystem
LowHigh Entropy Strings
LowUrl Strings
Affected versions and remediation
This report applies to @sapiom/mcp@0.12.9.
See all versions of @sapiom/mcp for other recorded verdicts.
- Review the evidence and your use of @sapiom/mcp@0.12.9 before allowing it. Restrict the permissions described in this report.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
Evidence last updated: .
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