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.

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History

Tue, 21 Apr 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 21 Apr 2026 16:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Twenty: Stored XSS via BlockNote FileBlock
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 5.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-21T16:56:02.097Z

Reserved: 2026-04-02T19:25:52.192Z

Link: CVE-2026-35451

cve-icon Vulnrichment

Updated: 2026-04-21T16:55:52.016Z

cve-icon NVD

Status : Received

Published: 2026-04-21T17:16:53.087

Modified: 2026-04-21T17:16:53.087

Link: CVE-2026-35451

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses