CVE-2026-55491

Published: Aug 20, 2026Modified: Aug 21, 2026

5.4

Vector

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

Exploitability: 2.3 / Impact: 2.7

Source: security-advisories@github.com (Secondary)

Description

BigBlueButton is an open-source virtual classroom. Prior to 3.0.29, BigBlueButton failed to escape meetingName in record-and-playback/screenshare/playback/index.html.erb when generating the screenshare playback format. A low-privileged user could store a crafted meeting name that embedded script content, and the script executed in another user's browser when that user replayed the recording. This issue is fixed in version 3.0.29.

Related CWEs

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

References (3)

https://github.com/bigbluebutton/bigbluebutton/commit/a53f2b92022388bfa4109d3136d1f3a932404b1b

Source: security-advisories@github.com

https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.29

Source: security-advisories@github.com

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-57p5-c888-74f9

Source: security-advisories@github.com

Timeline

No history available yet.