What’s Vulnerable › Vulnerabilities

CVE-2022-29233: Improper access control for breakout rooms in BigBlue Button

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-06-02 · updated 2026-06-17
• Weakness: CWE-285

Description

BigBlueButton is an open source web conferencing system. In BigBlueButton starting with 2.2 but before 2.3.18 and 2.4-rc-1, an attacker can circumvent access controls to gain access to all breakout rooms of the meeting they are in. The permission checks rely on knowledge of internal ids rather than on verification of the role of the user. Versions 2.3.18 and 2.4-rc-1 contain a patch for this issue. There are currently no known workarounds.

Affected products

• bigbluebutton: from 2.2.0 before 2.3.18; 2.4-alpha1, 2.4-alpha2, 2.4-beta1, 2.4-beta2, 2.4-beta3, 2.4-beta4 — fixed in 2.3.18

How to fix

Upgrade to a fixed version: bigbluebutton 2.3.18. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/pull/13117
• https://github.com/bigbluebutton/bigbluebutton/pull/14265
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3mr9-p9gw-cf33
• https://github.com/bigbluebutton/bigbluebutton/pull/13117
• https://github.com/bigbluebutton/bigbluebutton/pull/14265
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-3mr9-p9gw-cf33

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