CVE-2021-32655: Files Drop public link can be added as federated share
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-32655?
CVE-2021-32655 has been classified as a medium severity vulnerability.
How do I fix CVE-2021-32655?
To fix CVE-2021-32655, upgrade Nextcloud Server to versions 19.0.11, 20.0.10, or 21.0.2 or later.
What are the consequences of CVE-2021-32655 if exploited?
Exploitation of CVE-2021-32655 may allow an attacker to convert a Files Drop link to a federated share, affecting user sharing experiences.
Which versions of Nextcloud Server are affected by CVE-2021-32655?
CVE-2021-32655 affects Nextcloud Server versions prior to 19.0.11, 20.0.10, and 21.0.2.
Is there a workaround for CVE-2021-32655?
There is no official workaround for CVE-2021-32655 other than applying the necessary updates.