Twenty: Stored XSS via BlockNote FileBlock_CVE-2026-35451

5.7 / 10

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

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.

Basic Information

ID CVE-2026-35451

Source GitHub_M

Published Apr 21, 2026 at 16:22

Affected Product

Vendor twentyhq

Product twenty

Version < 1.20.6

Affected Versions twentyhq twenty < 1.20.6

CWE Classification

CWE-79

References

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    "published": "2026-04-21T16:22:30.378Z",
    "modified": "2026-04-21T16:22:30.378Z",
    "type": "cve",
    "title": "Twenty: Stored XSS via BlockNote FileBlock",
    "source": "GitHub_M",
    "references": "https://github.com/twentyhq/twenty/security/advisories/GHSA-7w89-7q26-gj7q\nhttps://github.com/twentyhq/twenty/commit/8da69e0f77ea820a6845a4c3c025b6af3861d523",
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