CVE-2026-41127 PUBLISHED

BigBlueButton's missing authorization allows viewer to inject/overwrite captions

Assigner: GitHub_M
Reserved: 17.04.2026 Published: 21.04.2026 Updated: 21.04.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	bigbluebutton
Product	bigbluebutton
Versions	Version < 3.0.24 is affected

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-q387-2q28-mg33

Problem Types

CWE-639: Authorization Bypass Through User-Controlled Key CWE