Medium
BigBlueButton has Stored XSS in bbb-playback replay
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-27737
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 03:57 UTC · Revision 1
Source evidence
BigBlueButton has Stored XSS in bbb-playback replay
core-osv · Original sourcePublished 18 May 2026, 21:11 UTC
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.
osv:CVE-2026-27737
Complete source record
{
"id": "3421f2d48b9038185c9e12f98818abdcb90bef313438a3d5ba0b18238c66dfdd",
"url": "https://osv.dev/vulnerability/CVE-2026-27737",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "BigBlueButton has Stored XSS in bbb-playback replay",
"summary": "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.",
"evidence": "osv:CVE-2026-27737",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-27737",
"aliases": [
"CVE-2026-27737",
"GHSA-8vv7-vj94-q2pv"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/bigbluebutton/bbb-playback",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "317cae1e83dcde3f5057d0af71890e42b51bd3ff"
},
{
"fixed": "09e89bfe4ff8488b68c3ff040d3081e419dc89b1"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "5.4.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "09e89bfe4ff8488b68c3ff040d3081e419dc89b1"
}
],
"source": "REFERENCES_COMMIT"
}
]
}
},
{
"repo": "https://github.com/bigbluebutton/bigbluebutton",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "69f45aa1b963dc7d80179d0155acc670aec5c4fc"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.0.19"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "69f45aa1b963dc7d80179d0155acc670aec5c4fc"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "69f45aa1b963dc7d80179d0155acc670aec5c4fc"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.0.19"
},
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.0.19"
}
],
"source": "DESCRIPTION"
}
]
}
},
{
"repo": "https://github.com/blindsidenetworks/scalelite",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "832fda8eff87d8c2a17c3943e347afc8504c3897"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.7.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "832fda8eff87d8c2a17c3943e347afc8504c3897"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.7.0"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27737.json"
}
}
],
"modified": "2026-10-28T02:30:49.404014583Z",
"provider": "osv",
"references": [
"https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19",
"https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27737.json",
"https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27737",
"https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1",
"https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27737.json"
}
},
"related_cves": [
{
"value": "CVE-2026-27737",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517940,
"published_at": "2026-05-18T21:11:17.611+00:00"
}