CVE-2019-15617: Nextcloud Server

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

A missing check in Nextcloud Server 17.0.0 allowed an attacker to set up a new second factor when trying to login.

Affected products

• Nextcloud Nextcloud Server: before 17.0.1 (fixed in 17.0.1)

Published 2020-02-04. Last modified 2026-06-17.