Smash Balloon Social Photo Feed – Easy Social Feeds Plugin <= 6.11.1 - Cross-Site Request Forgery to oEmbed Access Token Overwrite via 'sbi_access_token' Parameter

The Smash Balloon Social Photo Feed – Easy Social Feeds Plugin plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 6.11.1. This is due to missing or incorrect nonce validation on the maybe_connection_data function. This makes it possible for unauthenticated attackers to overwrite the site's Instagram and Facebook oEmbed access tokens via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.