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CVE Vulnerability Details :
CVE-2026-27737
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-18 May, 2026 | 21:11
Updated At-19 May, 2026 | 12:11
Rejected At-
▼CVE Numbering Authority (CNA)
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.

Affected Products
Vendor
bigbluebutton
Product
bigbluebutton
Versions
Affected
  • < 3.0.19
Vendor
blindsidenetworks
Product
scalite
Versions
Affected
  • < 1.7.0
Vendor
bigbluebutton
Product
bbb-playback
Versions
Affected
  • < 5.4.3
Problem Types
TypeCWE IDDescription
CWECWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
3.16.5MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Version: 3.1
Base score: 6.5
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
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
Hyperlink: https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1
Resource:
x_refsource_MISC
Hyperlink: https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc
Resource:
x_refsource_MISC
Hyperlink: https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
Resource:
x_refsource_MISC
Hyperlink: https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found