CVE-2026-27736 MEDIUM

CVE-2026-27736: BigBlueButton has Open Redirect vulnerability in ApiController

Vendor Bigbluebutton
Product bigbluebutton
Weakness CWE-601 · Open redirect
Published February 25, 2026
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

6.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

February 25, 2026 CVE published
February 26, 2026 Record updated