What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-16 · updated 2026-06-17
• Weakness: CWE-345

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.

Affected products

• bigbluebutton: before 2.4.3 — fixed in 2.4.3

How to fix

Upgrade to a fixed version: bigbluebutton 2.4.3. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4.3
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5-alpha-1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rgjp-3r74-g4cm
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4.3
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5-alpha-1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-rgjp-3r74-g4cm

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