Medium severity · published Oct 9, 2025
CVE-2025-55200
BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes
5.4
CVSS
0.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BI
bigbluebutton · bigbluebutton
< 3.0.13 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-55200
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-55200
Issue Tracking
https://github.com/bigbluebutton/bbb-pads/pull/67
Release Notes
https://github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4
Issue Tracking
https://github.com/bigbluebutton/bigbluebutton/pull/23693
Vendor Advisory
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2
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