The YouTube Embed WordPress plugin before 5.2.2 does not validate, escape or sanitise some of its shortcode attributes, leading to Stored XSS issues by 1. using w, h, controls, cc_lang, color, language, start, stop, or style parameter of youtube shortcode, 2. by using style, class, rel, target, width, height, or alt parameter of youtube_thumb shortcode, or 3. by embedding a video whose title or description contains XSS payload (if API key is configured).

Cross-site scripting (XSS) vulnerability in includes/options-profiles.php in the YouTube Embed plugin before 3.3.3 for WordPress allows remote administrators to inject arbitrary web script or HTML via the Profile name field (youtube_embed_name parameter).