Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

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

Medium 5.7

In plain English

A medium-severity cross-site scripting in twenty from twentyhq. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)5.7Medium

Exploit odds (30 days)0.3%top 76.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
twentyhq	twenty	< 1.20.6

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

References

https://github.com/twentyhq/twenty/security/advisories/GHSA-7w89-7q26-gj7q x_refsource_CONFIRM
https://github.com/twentyhq/twenty/commit/8da69e0f77ea820a6845a4c3c025b6af3861d523 x_refsource_MISC