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OpenAdvisories
Malicious MAL-2026-14016

preinstall-hook-webhook-callback-demo

npm package · versions 1.0.1, 1.0.0

Reported Aug 13, 2026 · Updated Aug 13, 2026

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: amazon-inspector (d6e707d55368c2628038e0efaac35629fba6dbd520e66a7e29f9c6a86c69b2e1)
package.json declares a preinstall lifecycle script that contacts webhook.site, an ephemeral request-capture service commonly used as an attacker-controlled exfiltration sink. The hook fires automatically on `npm install` before any user interaction, and webhook.site is not a first-party or documented destination for any legitimate build or runtime purpose of this package. The combination of an auto-executing preinstall script wired to an out-of-band capture endpoint is the shape of installer-side data exfiltration / callback beaconing at install time.