Reinism

**Name of the Vulnerable Software and Affected Versions** Nextcloud Server versions prior to 12.0.8 Nextcloud Server versions prior to 13.0.3 **Description** The issue arises from improper checks of dropped permissions for incoming shares, allowing a user to request previews for files they should not have access to. **Recommendations** For versions prior to 12.0.8, update to version 12.0.8 or later. For versions prior to 13.0.3, update to version 13.0.3 or later.