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.

CVSS 3.1

5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-25)

CWE

CWE-79

Published

2025-10-09

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

Affected

• bigbluebutton:bigbluebutton

References

• https://github.com/bigbluebutton/bbb-pads/pull/67
• https://github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4
• https://github.com/bigbluebutton/bigbluebutton/pull/23693
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2

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