CVE-2025-55200

Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-10-09

Last updated on: 2025-10-20

Assigner: GitHub, Inc.

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.

CVSS Scores

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Meta Information

Published

2025-10-09

Last Modified

2025-10-20

Generated

2026-07-06

AI Q&A

2025-10-09

EPSS Evaluated

2026-07-05

NVD

CVE-2025-55200

EUVD

EUVD-2025-33584

Affected Vendors & Products

Vendor	Product	Version / Range
bigbluebutton	bigbluebutton	to 3.0.13 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in BigBlueButton versions prior to 3.0.13. It occurs in the "Shared Notes" feature where the "Username" field input is not properly sanitized. A low-privileged user can input malicious JavaScript code as their username, which is then executed in the context of higher-privileged users (such as Admins) when they view the Shared Notes page.

Impact Analysis

The vulnerability allows a low-privileged user to execute arbitrary JavaScript code in the browsers of higher-privileged users. This can lead to unauthorized actions performed with the privileges of those users, potentially compromising sensitive data, hijacking user sessions, or performing administrative actions without permission.

Mitigation Strategies

Upgrade BigBlueButton to version 3.0.13 or later, as this version fixes the Stored Cross-Site Scripting (XSS) vulnerability in the Shared Notes feature.

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