Twitch Player <= 2.1.0 - Authenticated (Admin+) Stored Cross-Site Scripting

The Twitch Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘swti_options_player[swti_player_welcome_bg_colour]’, 'swti_options_player[swti_player_welcome_image]', 'swti_options_player[swti_player_welcome_logo]', 'swti_options_player[swti_player_welcome_text]', 'swti_options_player[swti_player_welcome_text_2]', and 'swti_options_player[swti_player_welcome_text_colour]' parameters in versions up to, and including, 2.1.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with administrative-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.