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CVE-2026-27737

BigBlueButton has Stored XSS in bbb-playback replay

BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Bigbluebutton Blindsidenetworks
Products
Bbb-playback Bigbluebutton Scalite
CVE-2023-7296

BigBlueButton <= 3.0.0-beta.4 - Authenticated (Author+) Stored Cross-Site Scripting

The BigBlueButton plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the moderator code and viewer code fields in versions up to, and including, 3.0.0-beta.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with author privileges or higher to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Blindsidenetworks Wordpress
Products
Bigbluebutton Wordpress
CVE-2023-39991

WordPress BigBlueButton Plugin <= 3.0.0-beta.4 is vulnerable to Cross Site Scripting (XSS)

Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Blindside Networks BigBlueButton plugin <= 3.0.0-beta.4 versions.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed
Vendors
Blindsidenetworks
Products
Bigbluebutton