Input validation error in BigBlueButton - CVE-2026-27466
Published: February 20, 2026
Vulnerability identifier: #VU123109
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-27466
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to exposed ClamAV port. A remote attacker can send complex or large documents to clamd and perform a denial of service (DoS) attack.
Affected software
BigBlueButton
How to mitigate CVE-2026-27466
Install updates from vendor's website.
BigBlueButton - update to 3.0.22