CVE-2025-55200: bigbluebutton XSS — Fix

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.

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CVSS v3.1 Score

7.1

HIGH

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
bigbluebutton	bigbluebutton	< 3.0.13

References

Advisories & Patches

https://github.com/bigbluebutton/bigbluebutton/pull/23693 https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2

Other References

https://github.com/bigbluebutton/bbb-pads/pull/67 https://github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2025-55200? +

CVE-2025-55200 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-55200? +

CVE-2025-55200 affects products from bigbluebutton, specifically: bigbluebutton. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-55200? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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