CVE-2026-41126

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

State: Published
Severity: 4.3 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 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.

Scores

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

Weaknesses

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

Affected Products

Product	Versions
bigbluebuttonbigbluebutton	< 3.0.24Affected

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-cvwj-4pcp-f3g8

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