CVE-2021-4143 Cross-site Scripting (XSS) - Generic in bigbluebutton/bigbluebutton

High 8.1 Published 19 Jan 2022 Updated 3 Aug 2024

Attackers can inject malicious scripts into BigBlueButton sessions, potentially stealing user data or hijacking accounts.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-4143?

CVE-2021-4143 is a high-severity cross-site scripting vulnerability in bigbluebutton/bigbluebutton, published on 19 Jan 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Cross-site Scripting (XSS) - Generic in GitHub repository bigbluebutton/bigbluebutton prior to 2.4.0.

Weakness: CWE-79

Which versions are affected by CVE-2021-4143?

It affects 1 product.

Products include Bigbluebutton Bigbluebutton.

How do I fix CVE-2021-4143?

No fix has been published for CVE-2021-4143 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2021-4143 being exploited?

There is no known exploitation of CVE-2021-4143 in the wild and no public exploit code.

Sources

Also known as GHSA-rq88-x89h-6r64.