CVE-2026-41127 BigBlueButton's missing authorization allows viewer to inject/overwrite captions
Attackers can inject or overwrite captions in BigBlueButton virtual classrooms due to missing authorization checks for viewers.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-41127?
CVE-2026-41127 is a medium-severity missing authorization vulnerability in bigbluebutton, published on 21 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-41127?
How do I fix CVE-2026-41127?
No fix has been published for CVE-2026-41127 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-41127 being exploited?
There is no known exploitation of CVE-2026-41127 in the wild and no public exploit code.
Sources
Also known as GHSA-q387-2q28-mg33.