CVE-2025-55200: Bigbluebutton

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.13, the "Shared Notes" feature contains a Stored Cross-Site Scripting (XSS) vulnerability with the input location being the "Username" field and the output location on the "Shared Notes" page, when a user with a malicious username is editing content. This vulnerability allows a low-privileged user to execute arbitrary JavaScript in the context of higher-privileged users (e.g., Admins) who open the Shared Notes page. Version 3.0.13 fixes the issue.

Affected products

• Bigbluebutton Bigbluebutton: before 3.0.13 (fixed in 3.0.13)

Published 2025-10-09. Last modified 2026-06-17.