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CVE-2026-27736

BigBlueButton has Open Redirect vulnerability in ApiController

Published: Feb 25, 2026Updated: Mar 5, 2026 Sources: CVE List NVDCWE-601
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.1%
Top 95.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

BigBlueButton is an open-source virtual classroom. In versions on the 3.x branch prior to 3.0.20, the string received with errorRedirectUrl lacks validation, using it directly in the respondWithRedirect function leads to an Open Redirect vulnerability. BigBlueButton 3.0.20 patches the issue. No known workarounds are available.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
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

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/bigbluebutton/bigbluebutton/commit/691f92f3af0d6b796b91cb968977068663119812
github.com
https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-65cv-rg9f-qqrx
github.com

Timeline

Published
Feb 25, 2026
Last Updated
Mar 5, 2026

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