CVE-2026-41127
Received Received - Intake
Authorization Bypass in BigBlueButton Allows Caption Injection

Publication date: 2026-04-22

Last updated on: 2026-04-22

Assigner: GitHub, Inc.

Description
BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have a missing authorization that allows viewers to inject/overwrite captions Version 3.0.24 tightened the permissions on who is able to submit captions. No known workarounds are available.
CVSS Scores
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Meta Information
Published
2026-04-22
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-15
NVD
CVE-2026-41127
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
bigbluebutton bigbluebutton to 3.0.24 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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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.
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Executive Summary

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.

Impact Analysis

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.

Detection Guidance

There are no specific commands or detection methods provided to identify this vulnerability on your network or system.

Mitigation Strategies

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.

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