Cross-site scripting in BigBlueButton - CVE-2022-31065
Published: June 22, 2022 / Updated: May 14, 2026
Vulnerability identifier: #VU131445
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2022-31065
CWE-ID: CWE-79
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 user to execute arbitrary JavaScript in the victim's browser.
The vulnerability exists due to cross-site scripting in the private chat username handling when rendering private chat messages or leave notifications. A remote user can embed malicious JavaScript in a username to execute arbitrary JavaScript in the victim's browser.
User interaction is required for the victim to receive a private chat message or a notification that the sender left the session.
How to mitigate CVE-2022-31065
Install security update from vendor's website.