CVE-2026-35451: Twentyhq Twenty

Medium severity, CVSS 5.7. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Twentyhq Twenty: before 1.20.6 (fixed in 1.20.6)

Published 2026-04-21. Last modified 2026-06-17.