CVE-2025-55200 HIGH

CVE-2025-55200: BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes

Vendor Bigbluebutton
Product bigbluebutton
Weakness CWE-79 · XSS
Published October 9, 2025
Last update October 9, 2025
View on NVD All CVEs

CVSS base score

7.1/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

October 9, 2025 CVE published
October 9, 2025 Record updated