Smash Balloon Social Photo Feed <= 1.11.3 - Cross-Site Request Forgery to Back-Up Deletion

The Smash Balloon Social Photo Feed plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.11.3. This is due to missing or incorrect nonce validation on the sbi_clear_backups() function. This makes it possible for unauthenticated attackers to clear the plugins back-ups via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.