What is CVE-2026-35451?

CVE-2026-35451 is a medium-severity vulnerability in Twentyhq Twenty, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-04-21.

How severe is CVE-2026-35451?

Medium severity. CVSS v3 base score is 5.7 out of 10.

XSS in Twentyhq Twenty

CVE-2026-35451

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 inspect…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (15.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.

Affected products

Twentyhq Twenty — versions < 1.20.6

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-35451?: CVE-2026-35451 is a medium-severity vulnerability in Twentyhq Twenty, classified under Cross-site Scripting. CVSS score: 5.7/10. Published 2026-04-21.
How severe is CVE-2026-35451?: Medium severity. CVSS v3 base score is 5.7 out of 10.