CVE-2026-88793: Unknown YouTube Embed

High severity, CVSS 8.8. EPSS: 0.5% chance of exploitation in the next 30 days.

The YouTube Embed WordPress plugin from 10.0 to 10.3 does not perform any authorisation check on one of its AJAX actions, relying only on a nonce it prints on every front-end page, and does not escape the stored data before rendering it, allowing unauthenticated attackers to store arbitrary web scripts which will execute in the session of any user viewing the affected content, including an administrator.

Affected products

• Unknown YouTube Embed: from 10.0, up to and including 10.3

Published 2026-09-13. Last modified 2026-09-14.