bill-commons MCP Server Security Report
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This server scored F. Run it behind runtime policy enforcement so one bad tool call can't become an incident.
- criticalNo command-injection sinks — 1 occurrence
Security controlslatest scored version v1.0.0
Each control is evaluated deterministically with evidence. The score is earned from passing controls; a failed guard caps it.
Security controlslatest scored version v1.0.0
Each control is evaluated deterministically with evidence. The score is earned from passing controls; a failed guard caps it.
Model–MCP Runtime Guardrails
- WarnStrict JSON Schema Enforcementschemas not strict
Tool inputs are constrained (additionalProperties:false), so unexpected arguments can't be smuggled in.
Fix: Set additionalProperties:false and require explicit parameters on every tool.
- PassIndirect Prompt Injection (IPI) Defensesguardno injection markers
Tool/prompt/resource text is free of hidden instructions that could hijack the agent.
- PassUser-in-the-Loop / Approval Scopeguardno destructive tool scope
No over-broad or destructive tools (arbitrary shell, bulk-delete) that warrant human approval.
- N/ATool Definition Integrityguardno prior version to diff
Every consecutive version pair is diffed for new injection markers or destructive scope — a risky diff anywhere in history is a rug-pull (fail, durable); benign description drift warns.
Application Security Checks
- FailNo command-injection sinksguard1 occurrence
Untrusted tool input reaching a shell yields remote code execution.
apps/web/lib/sitemap.ts:157Fix: Never pass tool arguments to a shell; use argv arrays with shell disabled.
- WarnNo path traversalguard1 occurrence
Naive path checks let tools read/write outside intended directories (EscapeRoute-class).
apps/web/components/SiteHeader.tsx:38Fix: Resolve to a canonical path and verify containment; reject ../ and symlinks.
- WarnNo SSRF sinksguard9 occurrences
Fetching tool-supplied URLs can pivot into internal networks and metadata services.
apps/api/billcommons_api/routers/feedback.py:54apps/web/components/AlertSignup.tsx:21apps/web/components/FeedbackForm.tsx:25apps/web/lib/api.ts:40Fix: Allow-list destinations; reject arbitrary/loopback/link-local URLs.
- WarnNo known-vulnerable dependencies2 of 50 runtime deps vulnerable; worst high
Runtime dependencies (parsed from the lockfile) are scanned against OSV.dev for published CVEs. Advisory: flagged dependencies lower the score but don't hard-cap it, since transitive reachability is unproven.
[email protected] — GHSA-6g55-p6wh-862q[email protected] — GHSA-qx2v-qp2m-jg93[email protected] — GHSA-r28c-9q8g-f849[email protected] — GHSA-f88m-g3jw-g9cjFix: Upgrade the flagged dependencies past their fixed versions.
- WarnAdoption & popularitylimited adoption
A small, capped nudge from stars/downloads — widely-used servers get more eyes on bugs. It can never offset a real security failure.
Fix: Adoption grows naturally with real-world use; this never gates the score.
- PassNo dynamic code executionguardno sinks found
eval()/exec()/Function() on tool-derived strings allows arbitrary code execution.
- PassNo unsafe deserializationguardno sinks found
pickle/yaml.load/etc. on untrusted data can execute code.
- PassNo committed secretsguardno secrets found
Hardcoded keys/tokens in published source are live credentials an attacker can use.
- PassCredentials sourced from environmentreads credentials from environment
Reading secrets from env/secret stores avoids hardcoding them.
- PassDependencies pinned (lockfile)lockfile present
A lockfile makes installs reproducible and resistant to silent dependency swaps.
- PassActively maintainedrecent commits
Unmaintained servers don't receive security fixes.
- PassRepository not archivedguardactive
Archived repositories will never be patched.
- PassDeclares a licenseApache-2.0
A clear license is required for legal enterprise use.
- PassHas a security policySECURITY.md present
A SECURITY.md gives a private path to report vulnerabilities.
- Not checkedSigned releasesnot evaluated
Signed releases let consumers verify artifacts weren't tampered with.
- N/ANo install/post-install scriptsguardno published package
install hooks run arbitrary code on every consumer at install time.
- N/APackage name not typosquattingguardno published package
Names mimicking popular packages are a common malware delivery vector.
- N/APublished with provenanceno published package
Build provenance attests the artifact was built from the claimed source by CI.
- N/AEstablished maintainerno published package
Brand-new / single anonymous maintainers raise takeover and malware risk.
Transport & Trust Model
- WarnIAM / Authentication Scopingno authentication handling detected
OAuth 2.1 / Protected Resource Metadata gates who can invoke tools.
Fix: Implement OAuth 2.1 with a .well-known/oauth-protected-resource document.
- WarnNetwork Exposurebinds 0.0.0.0
Binding 0.0.0.0 or exposing debug inspectors widens the attack surface.
Fix: Bind to 127.0.0.1 by default; never ship open debug endpoints.
- PassTransport Encryption (TLS)guardall remotes use HTTPS
Plaintext HTTP exposes traffic and bearer tokens to interception.
- PassExecution Sandboxingcontainerized
A container/sandbox image limits blast radius; a server that runs natively has full host access.
- N/ALive Endpoint Reachablenot dynamically scanned
A dynamic scan connected to the declared remote endpoint and it responded — verified live, not a dead URL.
- N/AAuthentication Enforced (live)not dynamically scanned
If the server declares auth is required, it must actually reject anonymous clients. Serving tools to unauthenticated callers is a real exposure.
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[](https://index.canopii.dev/server/org.billcommons/bill-commons)<a href="https://index.canopii.dev/server/org.billcommons/bill-commons"><img src="https://index.canopii.dev/api/badge/org.billcommons/bill-commons" alt="Canopii Trust Score" /></a>Versions
| Version | Score | Status | Published |
|---|---|---|---|
| v1.0.0latest | 15F | scored | 7/28/2026 |