Lifecycle scripts with shell execution (postinstall, prepare)
npm packages with postinstall or prepare scripts execute automatically on npm install without user confirmation. Malicious or compromised packages have used this to exfiltrate environment variables or install persistent malware.
HOW VIBECHECK DETECTS THIS
vibecheck clones your repository and runs Gitleaks, Semgrep, njsscan, and a suite of custom checks targeting patterns common in AI-generated code. This check is part of the Supply Chain category. When a matching pattern is found, Claude triages the finding and produces a plain-English explanation and a concrete fix — no security expertise required.
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