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OpenAdvisories
Medium · 5.7 CVE-2026-35451 EUVD-2026-24161

Twenty: Stored XSS via BlockNote FileBlock

Published Apr 21, 2026 · Updated Apr 21, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
twentyhq twenty < 1.20.6 —

References