What’s Vulnerable › Vulnerabilities

CVE-2022-31064: Cross site scripting in username that will trigger by sending chat

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-27 · updated 2026-06-17
• Weakness: CWE-79

Description

BigBlueButton is an open source web conferencing system. Users in meetings with private chat enabled are vulnerable to a cross site scripting attack in affected versions. The attack occurs when the attacker (with xss in the name) starts a chat. in the victim's client the JavaScript will be executed. This issue has been addressed in version 2.4.8 and 2.5.0. There are no known workarounds for this issue.

Affected products

• bigbluebutton: from 2.4 before 2.4.8; 2.3.0, 2.4.9, 2.5-alpha1, 2.5-alpha2, 2.5-alpha3, 2.5-alpha4 (+8) — fixed in 2.4.8

How to fix

Upgrade to a fixed version: bigbluebutton 2.4.8. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/167682/BigBlueButton-2.3-2.4.7-Cross-Site-Scripting.html
• http://seclists.org/fulldisclosure/2022/Jun/52
• https://github.com/bigbluebutton/bigbluebutton/pull/15067
• https://github.com/bigbluebutton/bigbluebutton/pull/15090
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-hwv2-5pf5-hr87
• https://pentests.nl/pentest-blog/stored-xss-in-bigbluebutton/
• http://packetstormsecurity.com/files/167682/BigBlueButton-2.3-2.4.7-Cross-Site-Scripting.html
• http://seclists.org/fulldisclosure/2022/Jun/52
• https://github.com/bigbluebutton/bigbluebutton/pull/15067
• https://github.com/bigbluebutton/bigbluebutton/pull/15090
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-hwv2-5pf5-hr87
• https://pentests.nl/pentest-blog/stored-xss-in-bigbluebutton/

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