Inline Tweet Sharer <= 2.5.3 - Authenticated (Admin+) Stored Cross-Site Scripting

The Inline Tweet Sharer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via plugin setting options parameters (such as 'inline-tweet-sharer-default', 'inline-tweet-sharer-dprefix', 'inline-tweet-sharer-dsuffix' and 'inline-tweet-sharer-extraclass') in versions up to, and including, 2.5.3 due to insufficient input sanitization and output escaping. This makes it possible for administrator-level attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.