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CVE-2026-41126

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

Published: Apr 21, 2026Updated: Apr 22, 2026 Sources: CVE List NVDCWE-601
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
0.2%
Top 86.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-601

Affected Products

bigbluebuttonbigbluebutton
On-premWeb App
Communications / video-conferencing
bigbluebuttonoss-projectCommunicationsaka bbb

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

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

Timeline

Published
Apr 21, 2026
Last Updated
Apr 22, 2026

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