Nextcloud is an open-source, self-hosted productivity platform. Prior to Nextcloud Server versions 20.0.13, 21.0.5, and 22.2.0, the Two-Factor Authentication wasnt enforced for pages marked as public. Any page marked as @PublicPage could thus be accessed with a valid user session that isnt authenticated. This particularly affects the Nextcloud Talk application, as this could be leveraged to gain access to any private chat channel without going through the Two-Factor flow. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.
The product implements an authentication technique, but it skips a step that weakens the technique.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Server | Nextcloud | 20.0.3 (including) | 20.0.13 (excluding) |
| Server | Nextcloud | 21.0.1 (including) | 21.0.5 (excluding) |
| Server | Nextcloud | 22.1.1 (including) | 22.2.0 (excluding) |