Nextcloud server authorization issue vulnerability (CNVD-2021-102886)

Nextcloud server is an open source self-hosted file synchronization and sharing communication application platform from Nextcloud Germany. nextcloud server is vulnerable to authorization issues in versions prior to 20.0.12, 21.0.4 or 22.1.0. The vulnerability stems from a lack of authentication measures or insufficient authentication strength in the network system or product. insufficient strength. An attacker could exploit this vulnerability to bypass two-factor authentication in Nextcloud.