Medium 6.5Published May 18, 2026

CVE-2026-27737BigBlueButton has Stored XSS in bbb-playback replay

Updated under an hour ago (Oct 27, 2026, 2:30 AM ET)

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It affects bigbluebutton and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for bigbluebutton

Exploited in the last 30 days

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: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: May 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

bigbluebutton bigbluebutton bigbluebutton:bigbluebutton (from the name)	before 3.0.19	CNA record
blindsidenetworks scalite blindsidenetworks:scalite (from the name)	before 1.7.0	CNA record
bigbluebutton bbb-playback bigbluebutton:bbb_playback (from the name)	before 5.4.3	CNA record

References

References

https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv	x-refsource-confirm
https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1	x-refsource-misc
https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc	x-refsource-misc
https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19	x-refsource-misc
https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.