CVE-2026-41126 BigBlueButton has Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL"
Attackers can redirect users to malicious sites via the logoutURL parameter in BigBlueButton join API requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-41126?
CVE-2026-41126 is a medium-severity vulnerability in bigbluebutton, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have an Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL." Version 3.0.24 has adjusted the handling of requests with incorrect checksum so that the default logoutURL is used. No known workarounds are available.
Weakness: CWE-601
Which versions are affected by CVE-2026-41126?
How do I fix CVE-2026-41126?
No fix has been published for CVE-2026-41126 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-41126 being exploited?
There is no known exploitation of CVE-2026-41126 in the wild and no public exploit code.
Sources
Also known as GHSA-cvwj-4pcp-f3g8.