GCVE-110-OSM-2026-3187

Advisory PublishedCVSS 8.8/10

Vulnetix · Advisory published April 26, 2026

Executes a remote JavaScript infostealer payload from oob.moika.tech via preinstall hook eval() at npm install time. Part of a 6-package dependency confusion campaign targeting the kl-b2c-ui-kit namespace. Publisher: boris.wh1te@yandex.ru. **Trigger** (`preinstall`): executes `node preinstall.js` at install time. **Fetch**: fetches `http://oob.moika.tech/kl-b2c-ui-kit/...` via HTTP GET. **Execution**: eval()s the HTTP response body, granting the C2 server arbitrary code execution in the victim build environment. Shared C2 infrastructure and identical hook SHA256 with 5 sibling packages in this dep-confusion campaign.

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

8.8/10

High · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
unknown	kl-b2c-ui-kit	99.0.0 (affected)	—

References

Malicious npm package: kl-b2c-ui-kit

advisory

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