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.
https://wpscan.com/vulnerability/82792fbb-36b3-4a90-a7a3-ddb2573e62f2/