pincushion-mcp@1.11.20
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AI Security Review
scanned 2mo ago · by lpm-firewall-aiThe package is not malicious on the inspected source evidence, but its MCP upload tool creates a concrete arbitrary-file exfiltration path. No lifecycle hook or automatic payload execution was found.
Static reason
High-risk behavior combination matched malicious policy.; previous stored version diff introduced dangerous source
Trigger
An MCP client calls upload_page_snapshot with imagePath, dimensions, projectId, and pageUrl while cloud sync is configured.
Impact
A compromised or over-permissioned agent could disclose local files, including credentials, to the configured endpoint.
Mechanism
Arbitrary file read followed by base64 upload.
AI rationale
The package is not malicious on the inspected source evidence, but its MCP upload tool creates a concrete arbitrary-file exfiltration path. No lifecycle hook or automatic payload execution was found.
Evidence
server.js
Network endpoints1
dpsqzszdviltqvethxbr.supabase.co
Decision evidence
public snapshotAI called this Suspicious at 94.0% confidence as Critical Vulnerability with low false-positive risk.
Evidence for warning
- The MCP snapshot tool reads any caller-supplied file path without restricting it to image files or the project.
- It base64-encodes that file and posts the bytes to the configured cloud endpoint.
- The default cloud endpoint is a Pincushion Supabase host, but an environment variable can replace it.
Evidence against
- package.json has no install or postinstall lifecycle hook.
- The simulator command execution is reached only through the explicit mobile-wall subcommand and uses fixed executable names.
- The observed cloud synchronization and telemetry are product-aligned; the arbitrary-path upload is the concrete unsafe capability.
Behavioral surface
ChildProcessCryptoEnvironmentVarsFilesystemNetworkShell
HighEntropyStringsTelemetryUrlStrings
NoLicense
Source & flagged code
11 flaggedmobile-wall.mjsView file
17// injectable so both modes are testable without a simulator.
L18: import { execFileSync } from 'node:child_process';
L19: import {
High
mobile-wall.mjs#virtual:normalized:round1View file
121function publicUrlFrom(text) {
L122: const m = /(https?:\/\/[^\s"'<>]+)/.exec(String(text || ''));\n return m ? m[1].replace(/[),.;]+$/, '') : '';\n}\n\nasync function fetchCloudAnnotations(ctx, { baseUrl, key, proje...
L123: }
Critical
Same File Env Network Execution
A single source file combines environment access, network access, and code or shell execution with blocking evidence.
mobile-wall.mjs#virtual:normalized:round1View on unpkg · L12117// injectable so both modes are testable without a simulator.
L18: import { execFileSync } from "node:child_process";
L19: import {
...
L32: const DEFAULT_OUT = "crit-wall";
L33: const DEFAULT_FUNCTION_BASE = "https://dpsqzszdviltqvethxbr.supabase.co/functions/v1";
L34:
...
L78: function isSignedIn() {
L79: if (process.env.PINCUSHION_LICENSE_KEY) return true;
L80: try { return !!readFileSync(join(homedir(), ".pincushion", "license-key"), "utf8").trim(); } catch { return false; }
L81: }
...
L97: const firstLine = (e) => String(e.message || e).split("\n")[0];
L98: const execErrText = (e) => [e?.stderr, e?.stdout, e?.message].filter(Boolean).join("\n");
Findings
5 Critical7 High3 Medium6 Low
CriticalSame File Env Network Executionmobile-wall.mjs#virtual:normalized:round1
CriticalCredential Exfiltrationserver.js
CriticalDownload Executemobile-wall.mjs#virtual:normalized:round1
CriticalTrigger Reachable Dangerous Capabilityserver.js
CriticalPrevious Version Dangerous Deltalib/git.js
HighChild Processmobile-wall.mjs
HighShell
HighCommand Output Exfiltrationmobile-wall.mjs#virtual:normalized:round1
HighCopied Package Dependency Bridgelib/posthog.js
HighTrigger Reachable Credential Exfiltrationserver.js
HighTrigger Reachable Command Output Exfiltrationmobile-wall.mjs#virtual:normalized:round1
Affected versions and remediation
This report applies to pincushion-mcp@1.11.20.
See all versions of pincushion-mcp for other recorded verdicts.
- Review the evidence and your use of pincushion-mcp@1.11.20 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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