The Backup Migration WordPress plugin before 2.0.0 does not properly generate its backup path in certain server configurations, allowing unauthenticated users to fetch a log that discloses the backup filename. The backup archive is then downloadable without authentication.

The Backup Migration WordPress plugin before 2.1.7 does not properly restrict a post-restore automatic login mechanism, allowing a user who administers one site of a multisite network to obtain a long-lived authenticated session as an administrator of another site in the same network, without credentials and bypassing two-factor authentication.