What is CVE-2026-41127?

CVE-2026-41127 is a medium-severity vulnerability in Bigbluebutton, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-21.

How severe is CVE-2026-41127?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Auth bypass in Bigbluebutton

CVE-2026-41127

BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have a missing authorization that allows viewers to inject/overwrite captions Version 3.0.24 tightened the permissions on who is able to submit captions. No known…

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (8.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

Affected products

Bigbluebutton — versions < 3.0.24

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-q387-2q28-mg33 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-41127?: CVE-2026-41127 is a medium-severity vulnerability in Bigbluebutton, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 6.5/10. Published 2026-04-21.
How severe is CVE-2026-41127?: Medium severity. CVSS v3 base score is 6.5 out of 10.