CVE-2021-43787: Nodebb

Medium severity, CVSS 6.1. EPSS: 1.3% chance of exploitation in the next 30 days.

Nodebb is an open source Node.js based forum software. In affected versions a prototype pollution vulnerability in the uploader module allowed a malicious user to inject arbitrary data (i.e. javascript) into the DOM, theoretically allowing for an account takeover when used in conjunction with a path traversal vulnerability disclosed at the same time as this report. The vulnerability has been patched as of v1.18.5. Users are advised to upgrade as soon as possible.

Affected products

• Nodebb Nodebb: from 1.15.5, up to and including 1.18.4

Published 2021-11-29. Last modified 2026-06-17.