The Open Graph plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 1.11.2 via the 'opengraph_default_description' function. This makes it possible for unauthenticated attackers to extract sensitive data including partial content of password-protected blog posts.
https://plugins.trac.wordpress.org/changeset/3097574/
https://plugins.trac.wordpress.org/browser/opengraph/trunk/opengraph.php#L369