CVE-2026-35451 - Twenty: Stored XSS via BlockNote FileBlock

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MEDIUM

Twenty: Stored XSS via BlockNote FileBlock

Published Apr 21, 2026

5.7

MEDIUM

CVSS 3.1

EPSS 0.42%

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

Vendor Twentyhq Product Twenty Default
n/a
- Version
  < 1.20.6
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Twentyhq

Twenty

n/a

Version	Status	Constraints
< 1.20.6	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-79

Cross-site Scripting (XSS)

References (3)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24161
Advisory
https://github.com/twentyhq/twenty/commit/8da69e0f77ea820a6845a4c3c025b6af3861d523
x_refsource_MISC
https://github.com/twentyhq/twenty/security/advisories/GHSA-7w89-7q26-gj7q
exploitx_refsource_CONFIRM

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24161		Advisory
https://github.com/twentyhq/twenty/commit/8da69e0f77ea820a6845a4c3c025b6af3861d523		x_refsource_MISC
https://github.com/twentyhq/twenty/security/advisories/GHSA-7w89-7q26-gj7q		exploitx_refsource_CONFIRM