CVE-2021-32655: Nextcloud Server

Low severity, CVSS 3.5. EPSS: 1% chance of exploitation in the next 30 days.

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.11, 20.0.10, and 21.0.2, an attacker is able to convert a Files Drop link to a federated share. This causes an issue on the UI side of the sharing user. When the sharing user opens the sharing panel and tries to remove the "Create" privileges of this unexpected share, Nextcloud server would silently grant the share read privileges. The vulnerability is patched in versions 19.0.11, 20.0.10 and 21.0.2. No workarounds are known to exist.

Affected products

• Nextcloud Nextcloud Server: before 19.0.11 (fixed in 19.0.11); from 20.0.0, before 20.0.10 (fixed in 20.0.10); from 21.0.0, before 21.0.2 (fixed in 21.0.2)

Published 2021-06-01. Last modified 2026-06-17.