Medium
Twenty: Stored XSS via BlockNote FileBlock
Type: advisorySources: OSV
Twenty is an open source CRM. Prior to 1.20.6, a Stored Cross-Site Scripting (XSS) vulnerability exists in the BlockNote editor component. Due to a lack of protocol validation in the FileBlock component and insufficient server-side inspection of block content, an attacker can inject a javascript: URI into the url property of a file block. This allows the execution of arbitrary JavaScript when a user clicks on the malicious file attachment. This vulnerability is fixed in 1.20.6.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-35451
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 17:59 UTC · Revision 1
Source evidence
Twenty: Stored XSS via BlockNote FileBlock
core-osv · Original sourcePublished 21 Apr 2026, 16:22 UTC
Twenty is an open source CRM. Prior to 1.20.6, a Stored Cross-Site Scripting (XSS) vulnerability exists in the BlockNote editor component. Due to a lack of protocol validation in the FileBlock component and insufficient server-side inspection of block content, an attacker can inject a javascript: URI into the url property of a file block. This allows the execution of arbitrary JavaScript when a user clicks on the malicious file attachment. This vulnerability is fixed in 1.20.6.
osv:CVE-2026-35451
Complete source record
{
"id": "76dfd98130780cdd7feb39703aefb7ed9862c1f5e723995cecf4c5990b3e9811",
"url": "https://osv.dev/vulnerability/CVE-2026-35451",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Twenty: Stored XSS via BlockNote FileBlock",
"summary": "Twenty is an open source CRM. Prior to 1.20.6, a Stored Cross-Site Scripting (XSS) vulnerability exists in the BlockNote editor component. Due to a lack of protocol validation in the FileBlock component and insufficient server-side inspection of block content, an attacker can inject a javascript: URI into the url property of a file block. This allows the execution of arbitrary JavaScript when a user clicks on the malicious file attachment. This vulnerability is fixed in 1.20.6.",
"evidence": "osv:CVE-2026-35451",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-35451",
"aliases": [
"CVE-2026-35451",
"GHSA-7w89-7q26-gj7q"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/twentyhq/twenty",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "8d61bb9ae62609486aa18ae6d3e6f65ed19bb1fb"
},
{
"fixed": "8da69e0f77ea820a6845a4c3c025b6af3861d523"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
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{
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"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
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],
"source": "REFERENCES_COMMIT"
}
]
}
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35451.json"
}
}
],
"modified": "2026-10-28T02:30:31.286715775Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35451.json",
"https://github.com/twentyhq/twenty/security/advisories/GHSA-7w89-7q26-gj7q",
"https://nvd.nist.gov/vuln/detail/CVE-2026-35451",
"https://github.com/twentyhq/twenty/commit/8da69e0f77ea820a6845a4c3c025b6af3861d523"
],
"provider_metadata": {
"cwe_ids": [
"CWE-79"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35451.json"
}
},
"related_cves": [
{
"value": "CVE-2026-35451",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 498106,
"published_at": "2026-04-21T16:22:30.378+00:00"
}