CVE-2020-7642: Lazysizes Project Lazysizes

Medium severity, CVSS 5.4. EPSS: 0.9% chance of exploitation in the next 30 days.

lazysizes through 5.2.0 allows execution of malicious JavaScript. The following attributes are not sanitized by the video-embed plugin: data-vimeo, data-vimeoparams, data-youtube and data-ytparams which can be abused to inject malicious JavaScript.

Affected products

• Lazysizes Project Lazysizes: up to and including 5.2.0

Published 2020-04-22. Last modified 2026-06-17.