Open redirect in BigBlueButton - #VU125913
Published: April 14, 2026
Vulnerability identifier: #VU125913
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: N/A
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Blindside Networks
Affected software:
BigBlueButton
BigBlueButton
Detailed vulnerability description
The vulnerability allows a remote attacker to redirect a client to a malicious URL.
The vulnerability exists due to url redirection to an untrusted site in bigbluebutton/api/join when handling requests with the logoutURL get-parameter and an incorrect checksum. A remote attacker can supply a crafted logoutURL value to redirect a client to a malicious URL.
User interaction is required for the redirect to occur.
Remediation
Install security update from vendor's website.