Excel Webview2 MCP Server
@dsbissett/excel-webview2-mcp
npm
v0.0.13
Published by @dsbissett — no publish provenance and no vendor-owned scope, so the publisher could not be verified. The repository link below is self-declared.
Every server starts at 100. These are the exact deductions the deterministic engine applied — each one reproducible, none of it an opinion or an LLM's guess:
| Points | What was found | Category |
|---|---|---|
| −22 | Hardcoded Google API key in server code MTC-SRC-008 | exfiltration |
| −6.3 | Untrusted input concatenated into a command sink MTC-SRC-009 | injection |
Grade capped: 1 confirmed high finding → grade capped at C. A hard gate overrides the point total — no amount of clean surface buys back a confirmed catastrophe.
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind the deduction.
Findings 9
high Hardcoded Google API key in server code (build/src/tools/performance.js)MTC-SRC-008
A live-looking Google API key is hardcoded in `build/src/tools/performance.js:165`. Secrets in source ship to everyone who installs the package and are a direct credential leak.
Evidence: Google API key: AIza…(redacted)
Fix: Remove the secret, rotate it, and load credentials from the environment or a secret store.
Location: server build/src/tools/performance.js
high Shell/command execution in server code (build/src/browser.js)MTC-SRC-002
In the server's implementation (`build/src/browser.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/browser.js
high Shell/command execution in server code (build/src/daemon/client.js)MTC-SRC-002
In the server's implementation (`build/src/daemon/client.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/daemon/client.js
high Shell/command execution in server code (build/src/launch/forceShutdown.js)MTC-SRC-002
In the server's implementation (`build/src/launch/forceShutdown.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/launch/forceShutdown.js
high Shell/command execution in server code (build/src/launch/launchExcel.js)MTC-SRC-002
In the server's implementation (`build/src/launch/launchExcel.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/launch/launchExcel.js
high Shell/command execution in server code (build/src/telemetry/WatchdogClient.js)MTC-SRC-002
In the server's implementation (`build/src/telemetry/WatchdogClient.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/telemetry/WatchdogClient.js
high Shell/command execution in server code (build/src/utils/check-for-updates.js)MTC-SRC-002
In the server's implementation (`build/src/utils/check-for-updates.js:1`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: child_process
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/utils/check-for-updates.js
medium Hardcoded egress to an external endpoint (build/src/bin/check-latest-version.js)MTC-SRC-003
In the server's implementation (`build/src/bin/check-latest-version.js:7`): A hardcoded outbound call to a fixed external host inside server code is a classic exfiltration/telemetry channel — especially paired with reads of local data. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: fetch('https://registry.npmjs.org/@dsbissett%2fexcel-webview2-mcp/latest'
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/bin/check-latest-version.js
medium Untrusted input concatenated into a command sink (build/src/launch/launchExcel.js)MTC-SRC-009
In the server's implementation (`build/src/launch/launchExcel.js:268`): A shell/process command assembled from concatenated or interpolated values is command injection when any part is attacker-influenced — the OWASP canonical RCE flow. Verify what reaches the interpolated value. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: spawn(`"${
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server build/src/launch/launchExcel.js
What this scan could not see
- No tools were enumerated, so prompt-injection, capability and toxic-flow analysis had no tool surface to inspect. To grade a package’s real runtime tools, scan the running server: --command "npx -y <package>".
Versions
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.0.13 latest |
C 72/100 | 9 | 1.5.0 | 2026-07-22 |
Embed this score
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Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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