CVE-2025-55200

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.

• CWE-79

• https://github.com/bigbluebutton/bbb-pads/pull/67Issue Tracking, Product
• https://github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4Release Notes
• https://github.com/bigbluebutton/bigbluebutton/pull/23693Issue Tracking, Patch
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2Vendor Advisory

Published

Oct 9, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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