PT-2026-60543 · Bigbluebutton · Bigbluebutton

CVE-2026-46353 · Published 2026-07-16 · Updated 2026-07-16

Mitre

CVSS v3.1

8.1

High

Base vector

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

BigBlueButton is an open-source virtual classroom. Prior to 3.0.21, bbb-web checksum validation could be bypassed when a presentationUploadExternalUrl parameter was supplied to API request handling in CreateMeeting.java and ValidationService.java, allowing a user to send valid requests to some endpoints without a checksum. This issue is fixed in version 3.0.21.

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2026-46353

Affected Products

Bigbluebutton

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-46353 · Security Note
• https://github.com/bigbluebutton/bigbluebutton/commit/36fd1b407488a0c56ce620b91184d5a8aea68b3d · Note
• https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.21 · Note
• https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-43hc-5g2m-cqff · Note