CVE-2021-24471: YouTube Embed Project YouTube Embed

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

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).

Affected products

• YouTube Embed Project YouTube Embed: before 5.2.2 (fixed in 5.2.2)

Published 2021-08-16. Last modified 2026-06-17.