Medium severity6.5NVD Advisory· Published May 18, 2026· Updated May 19, 2026
CVE-2026-27737
CVE-2026-27737
Description
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.
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Affected products
1- Range: <3.0.19
Patches
Vulnerability mechanics
References
5- github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1nvd
- github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fcnvd
- github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19nvd
- github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pvnvd
- github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0nvd
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