What is CVE-2026-41126?

CVE-2026-41126 is a medium-severity vulnerability in Bigbluebutton, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-04-21.

How severe is CVE-2026-41126?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Open Redirect in Bigbluebutton

CVE-2026-41126

BigBlueButton is an open-source virtual classroom. Versions prior to 3.0.24 have an Open Redirect through bigbluebutton/api/join via get-parameter "logoutURL." Version 3.0.24 has adjusted the handling of requests with incorrect checksum so…

Vulnerability class: Open Redirect

EPSS: 0.000 (1.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Bigbluebutton — versions < 3.0.24

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-cvwj-4pcp-f3g8 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-41126?: CVE-2026-41126 is a medium-severity vulnerability in Bigbluebutton, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-04-21.
How severe is CVE-2026-41126?: Medium severity. CVSS v3 base score is 4.3 out of 10.