# CVE-2026-35451

> Vulnerability · severity: **MEDIUM** (CVSS 5.7).

## 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.

## Key facts

- **CVE ID:** CVE-2026-35451
- **Published:** 2026-04-21
- **CVSS severity:** MEDIUM
- **CVSS base score:** 5.7
- **CWE codes:** CWE-79

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-35451

## Citation

> AI Analytics. CVE-2026-35451. Retrieved 2026-07-04 from https://api.ai-analytics.org/cve/CVE-2026-35451. Derived from NIST NVD. Licensed CC0.

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