CVE-2025-55200
High
Description
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductBigbluebutton
PublishedOct 9, 2025
First seenOct 9, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- bigbluebutton bigbluebutton3.0.13 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| bigbluebutton bigbluebutton | v < 3.0.13 | 3.0.13 |
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