The JetBackup WordPress plugin before 3.1.23.5 does not verify the role or capabilities of the account it preserves across a restore or migration before granting it administrator privileges, allowing a subscriber-level user to gain administrator access after the site owner restores or migrates the site.

The JetBackup WordPress plugin before 2.0.9.9 doesn't use index files to prevent public directory listing of sensitive directories in certain configurations, which allows malicious actors to leak backup files.