Authorization bypass through user-controlled key in BigBlueButton - CVE-2026-41127
Published: April 14, 2026
Vulnerability identifier: #VU125912
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41127
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to modify captions.
The vulnerability exists due to improper access control in caption submission handling in bbb-apps-akka and bbb-graphql-actions when handling caption submission requests. A remote user can submit captions or overwrite existing ones to modify captions.
Viewers and non-audio users are able to perform the unauthorized caption changes.
Affected software
BigBlueButton
How to mitigate CVE-2026-41127
Install security update from vendor's website.
BigBlueButton - update to 3.0.24