CVE-2025-50023: Chris Coyier Codepen Embed Block

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Chris Coyier CodePen Embed Block codepen-embed-block allows Stored XSS.This issue affects CodePen Embed Block: from n/a through <= 1.2.0.

Affected products

• Chris Coyier Codepen Embed Block: up to and including 1.2.0

Published 2025-06-20. Last modified 2026-06-17.