CVE-2020-27608: Bigbluebutton

Medium severity, CVSS 6.1. EPSS: 0.8% chance of exploitation in the next 30 days.

In BigBlueButton before 2.2.28 (or earlier), uploaded presentations are sent to clients without a Content-Type header, which allows XSS, as demonstrated by a .png file extension for an HTML document.

Affected products

• Bigbluebutton Bigbluebutton: before 2.2.28 (fixed in 2.2.28)

Published 2020-10-21. Last modified 2026-06-17.