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CVE-2025-55200

BigBlueButton vulnerable to Stored XSS via name of user at Shared Notes

Published: Oct 9, 2025Updated: Oct 20, 2025 Sources: CVE List NVD BDUCWE-79
NVD MITRE
7.1CVSSHIGH
EPSS Score
0.2%
Top 87.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

bigbluebuttonbigbluebutton
On-premWeb App
Communications / video-conferencing
DIR-816 A2D-Link Corp.Networking Infrastructure
bigbluebuttonoss-projectCommunicationsaka bbb
d-link corp.commercialTWNetworking Infrastructureaka d-link corporation, d-link international

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-9jv9-cjrm-grj2
github.com
https://github.com/bigbluebutton/bbb-pads/pull/67
github.com
https://github.com/bigbluebutton/bigbluebutton/pull/23693
github.com
and 2 more references View all →

Timeline

Published
Oct 9, 2025
Last Updated
Oct 20, 2025

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