CVE-2021-29452: Curveballjs a12n-Server

Medium severity, CVSS 6.5. EPSS: 0.8% chance of exploitation in the next 30 days.

a12n-server is an npm package which aims to provide a simple authentication system. A new HAL-Form was added to allow editing users in version 0.18.0. This feature should only have been accessible to admins. Unfortunately, privileges were incorrectly checked allowing any logged in user to make this change. Patched in v0.18.2.

Affected products

• Curveballjs a12n-Server: from 0.18.0, before 0.18.2 (fixed in 0.18.2)

Published 2021-04-16. Last modified 2026-06-17.