CVE-2026-35451 — Twenty: Stored XSS via BlockNote FileBlock
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 i…
Published: 2026-04-21 · CVSS: 5.7 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7