CVE-2026-41126 PUBLISHED

BigBlueButton has Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL"

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 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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CVSS Score: 4.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	Low
Privileges Required	None	Integrity Impact	None
User Interaction	Required	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-cvwj-4pcp-f3g8

Problem Types

CWE-601: URL Redirection to Untrusted Site ('Open Redirect') CWE