Vulnerability · Published Oct 9, 2025 · Assigned by GitHub_M

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

High 7.1

In plain English

A high-severity cross-site scripting in bigbluebutton from bigbluebutton. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.2%top 83.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
bigbluebutton	bigbluebutton	< 3.0.13

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

References

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