XSS in Bigbluebutton
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (13.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Bigbluebutton — versions < 3.0.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2 (Vendor Advisory)
- github.com/bigbluebutton/bbb-pads/pull/67 (Product, Issue Tracking)
- github.com/bigbluebutton/bigbluebutton/pull/23693 (Patch, Issue Tracking)
- github.com/bigbluebutton/bbb-pads/releases/tag/v1.5.4 (Release Notes)
Frequently asked questions
- What is CVE-2025-55200?
- CVE-2025-55200 is a high-severity vulnerability in Bigbluebutton, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2025-10-09.
- How severe is CVE-2025-55200?
- High severity. CVSS v3 base score is 7.1 out of 10.
- Is CVE-2025-55200 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.