What’s Vulnerable › Vulnerabilities

CVE-2022-29236: Improper access control for pencil annotations 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-rc-6, an attacker can circumvent access restrictions for drawing on the whiteboard. The permission check is inadvertently skipped on the server, due to a previously introduced grace period. The attacker must be a meeting participant. The problem has been patched in versions 2.3.18 and 2.4-rc-6. 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 (+4) — 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/13803
• 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-6
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-p93g-r9gm-9v6r
• https://github.com/bigbluebutton/bigbluebutton/pull/13803
• 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-6
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-p93g-r9gm-9v6r

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