CVE-2022-41961

MEDIUM

BigBlueButton < 2.4-rc-6 - Ineffective User Ban Enforcement via Shared extId

Title source: llm

Description

BigBlueButton is an open source web conferencing system. Versions prior to 2.4-rc-6 are subject to Ineffective user bans. The attacker could register multiple users, and join the meeting with one of them. When that user is banned, they could still join the meeting with the remaining registered users from the same extId. This issue has been fixed by improving permissions such that banning a user removes all users related to their extId, including registered users that have not joined the meeting. This issue is patched in versions 2.4-rc-6 and 2.5-alpha-1. There are no workarounds.

References (3)

Core 3

Core References

Patch, Release Notes, Third Party Advisory x_refsource_confirm

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-wxjp-h88g-7fqg

Release Notes, Third Party Advisory x_refsource_misc

https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.4-rc-6

Release Notes, Third Party Advisory x_refsource_misc

https://github.com/bigbluebutton/bigbluebutton/releases/tag/v2.5-alpha-1

Scores

CVSS v3 4.3

EPSS 0.0028

EPSS Percentile 19.6%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-345 CWE-346

Status published

Products (2)

bigbluebutton/bigbluebutton 2.4 alpha1 (10 CPE variants)

bigbluebutton/bigbluebutton < 2.4

Published Dec 16, 2022

Tracked Since Feb 18, 2026