CVE-2026-27736
BigBlueButton has Open Redirect vulnerability in ApiController
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-601 |
| Vendor | bigbluebutton |
| Product | bigbluebutton |
| Published | Feb 25, 2026 |
| Last Updated | Feb 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
bigbluebutton / bigbluebutton
>= 3.0.0, < 3.0.20