CVE-2026-41127

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

State: Published
Severity: 6.5 Medium
Published: Apr 21, 2026
Updated: Apr 22, 2026
Reserved: Apr 17, 2026

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.

Scores

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

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
bigbluebuttonbigbluebutton	< 3.0.24Affected

References

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

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