What is CVE-2026-90821?

CVE-2026-90821 is a medium-severity vulnerability in Arcadia Technology, Llc Crafty Controller, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-16.

How severe is CVE-2026-90821?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Arcadia Technology, Llc Crafty Controller

CVE-2026-90821

An input neutralization vulnerability in the Webhook URL form field component of Crafty Controller allows a remote, authenticated attacker to perform stored XSS via malicious form input

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-16 · last modified 2026-10-16.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Arcadia Technology, Llc Crafty Controller

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

gitlab.com/crafty-controller/crafty-4/-/work_items/745

Frequently asked questions

What is CVE-2026-90821?: CVE-2026-90821 is a medium-severity vulnerability in Arcadia Technology, Llc Crafty Controller, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-10-16.
How severe is CVE-2026-90821?: Medium severity. CVSS v3 base score is 5.4 out of 10.