CVE-2023-39991 WordPress BigBlueButton Plugin <= 3.0.0-beta.4 is vulnerable to Cross Site Scripting (XSS)

Q: What is CVE-2023-39991?

CVE-2023-39991 is a high-severity cross-site scripting vulnerability in Blindside Networks BigBlueButton, published on 4 Sep 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Q: Is CVE-2023-39991 being exploited?

There is no known exploitation of CVE-2023-39991 in the wild and no public exploit code.

Q: How do I fix CVE-2023-39991?

No fix has been published for CVE-2023-39991 yet. Limit exposure of the affected software until one is available.

High 7.1 Published 4 Sep 2023 Updated 28 Apr 2026

Unauthenticated attackers can execute arbitrary scripts in victim browsers via reflected XSS in the BigBlueButton WordPress plugin.

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-2023-39991?

CVE-2023-39991 is a high-severity cross-site scripting vulnerability in Blindside Networks BigBlueButton, published on 4 Sep 2023. 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

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Blindside Networks BigBlueButton plugin <= 3.0.0-beta.4 versions.

Weakness: CWE-79

Which versions are affected by CVE-2023-39991?

It affects 1 product.

Products include Blindsidenetworks Bigbluebutton.

How do I fix CVE-2023-39991?

No fix has been published for CVE-2023-39991 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-2023-39991 being exploited?