CVE-2020-8127: Revealjs Reveal.js

Medium severity, CVSS 6.1. EPSS: 1.2% chance of exploitation in the next 30 days.

Insufficient validation in cross-origin communication (postMessage) in reveal.js version 3.9.1 and earlier allow attackers to perform cross-site scripting attacks.

Affected products

• Revealjs Reveal.js: up to and including 3.9.1

Published 2020-02-28. Last modified 2026-06-17.