BigBlueButton has Stored XSS in bbb-playback replay

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Summary

CVECVE-2026-27737
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-18 22:16:37 UTC
Updated2026-05-18 22:16:37 UTC
DescriptionBigBlueButton 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bigbluebutton Bigbluebutton affected < 3.0.19 Not specified
CNA Blindsidenetworks Scalite affected < 1.7.0 Not specified
CNA Bigbluebutton Bbb-playback affected < 5.4.3 Not specified

References

ReferenceSourceLinkTags
github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0 [email protected] github.com
github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155... [email protected] github.com
github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3... [email protected] github.com
github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj9... [email protected] github.com
github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19 [email protected] github.com
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