Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M
CVE-2026-41127BigBlueButton's missing authorization allows viewer to inject/overwrite captions
Medium 6.5
In plain English
A medium-severity authorization bypass via user-controlled key in bigbluebutton from bigbluebutton. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 7% of all known vulnerabilities).
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 92.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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 workarounds are available.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| bigbluebutton | bigbluebutton | < 3.0.24 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N