CVE-2022-41960 BigBlueButton contains DoS via failed authToken validation

Medium 4.3 Published 15 Dec 2022 Updated 17 Apr 2025

An attacker can force a victim to leave a conference by exploiting insufficient authentication token validation in BigBlueButton.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-41960?

CVE-2022-41960 is a medium-severity denial of service vulnerability in bigbluebutton, published on 15 Dec 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

BigBlueButton is an open source web conferencing system. Versions prior to 2.4.3, are subject to Insufficient Verification of Data Authenticity, resulting in Denial of Service. An attacker can make a Meteor call to `validateAuthToken` using a victim's userId, meetingId, and an invalid authToken. This forces the victim to leave the conference, because the resulting verification failure is also observed and handled by the victim's client. The attacker must be a participant in any meeting on the server. This issue is patched in version 2.4.3. There are no workarounds.

Weakness: CWE-345

Which versions are affected by CVE-2022-41960?

It affects 1 product.

Products include Bigbluebutton Bigbluebutton.

How do I fix CVE-2022-41960?

No fix has been published for CVE-2022-41960 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2022-41960 being exploited?

There is no known exploitation of CVE-2022-41960 in the wild and no public exploit code.

Sources

Also known as GHSA-rgjp-3r74-g4cm.