What’s Vulnerable › Vulnerabilities

CVE-2022-29234: Grace period for lock settings in public/private chats in BigBlueButton

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% 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. Starting in version 2.2 and prior to versions 2.3.18 and 2.4.1, an attacker could send messages to a locked chat within a grace period of 5s any lock setting in the meeting was changed. The attacker needs to be a participant in the meeting. Versions 2.3.18 and 2.4.1 contain a patch for this issue. There are currently no known workarounds.

Affected products

• bigbluebutton: from 2.2.0 before 2.3.18; from 2.4 before 2.4.1 — fixed in 2.3.18, 2.4.1

How to fix

Upgrade to a fixed version: bigbluebutton 2.3.18, 2.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/bigbluebutton/bigbluebutton/pull/13850
• https://github.com/bigbluebutton/bigbluebutton/pull/14265
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4.1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-36vc-c338-6xjv
• https://github.com/bigbluebutton/bigbluebutton/pull/13850
• https://github.com/bigbluebutton/bigbluebutton/pull/14265
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.3.18
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4.1
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-36vc-c338-6xjv

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