tesgfvbncsdbcv

GHSA-gh7p-8vpj-q8cg

Malicious code in tesgfvbncsdbcv (npm)

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

Published as part of a ClickFix-style fake-CAPTCHA phishing campaign documented by OX Security (see reference). The package's only file is index.html, declared as the npm "main" entry; package.json defines no preinstall/install/postinstall/prepare lifecycle script, so the payload does not execute at `npm install` time. index.html renders a fake Cloudflare Turnstile verification widget. An obfuscator.io-obfuscated inline script builds a hardcoded redirect URL to https://login.microsofte.live/ (a typosquat of a Microsoft sign-in domain), appends the visitor's original query-string parameters, and navigates the browser there via window.location.replace(). The package therefore does not attack the installing machine directly; it is used as a static file host on the npm CDN (e.g. unpkg/jsDelivr) so the index.html can be linked to and opened directly in a victim's browser as a phishing/ClickFix landing page. Published by npm user "johnvaldez9a" as part of a burst of near-identical single-purpose packages published between 2026-08-04 and 2026-08-24 that share this same fake-Turnstile-redirect page structure.

---

Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/5d4b3da3177e0aef279e52c6f96e99e7cc135d05/osv/malicious/npm/tesgfvbncsdbcv/MAL-2026-15618.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/5d4b3da3177e0aef279e52c6f96e99e7cc135d05/osv/malicious/npm/tesgfvbncsdbcv/MAL-2026-15618.json
- https://www.npmjs.com/package/tesgfvbncsdbcv/v/1.0.0
- https://www.ox.security/blog/research-clickfix-phishing-npm-packages
- https://github.com/advisories/GHSA-gh7p-8vpj-q8cg

Compromised versions (1)

= 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.