CVE-2026-41127
Authorization Bypass in BigBlueButton Allows Caption Injection
Publication date: 2026-04-22
Last updated on: 2026-04-22
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| bigbluebutton | bigbluebutton | to 3.0.24 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-639 | The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability affects BigBlueButton, an open-source virtual classroom software. Versions prior to 3.0.24 have a missing authorization control that allows viewers to inject or overwrite captions during a session.
Version 3.0.24 addresses this issue by tightening the permissions on who is allowed to submit captions.
There are no known workarounds available for this vulnerability.
How can this vulnerability impact me? :
The vulnerability allows unauthorized viewers to inject or overwrite captions in BigBlueButton sessions. This can lead to misinformation or manipulation of the content displayed to participants.
According to the CVSS score (6.5), the impact is significant in terms of integrity, as it allows unauthorized modification of caption data, but it does not affect confidentiality or availability.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
There are no specific commands or detection methods provided to identify this vulnerability on your network or system.
What immediate steps should I take to mitigate this vulnerability?
The immediate step to mitigate this vulnerability is to upgrade BigBlueButton to version 3.0.24 or later, as this version has tightened permissions on who can submit captions.
No known workarounds are available.