---
id: CVE-2021-3030
title: >-
  Cute Editor for ASP.NET 6.4 is vulnerable to reflected cross-site scripting
  caused by improper validation of the Theme GET parameter in
  colorpicker_more.aspx
summary: >-
  Cute Editor for ASP.NET 6.4 is vulnerable to reflected cross-site scripting
  caused by improper validation of the Theme GET parameter in
  colorpicker_more.aspx. A remote, unauthenticated attacker can craft a URL
  that, once opened by a vict…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-09-17'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T20:00:03.713'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2021-3030'
references:
  - url: 'https://github.com/athosgonzaga/CVE-2021-3030'
    label: cve@mitre.org
  - url: 'https://github.com/athosgonzaga/CVE-2021-3030'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00313
epssPercentile: 0.24429
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/athosgonzaga/CVE-2021-3030'
  checkedAt: '2026-09-24T07:52:54.573Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T13:35:58.662293Z'
ingestedAt: '2026-09-17T20:28:02.783Z'
---

## Overview

Cute Editor for ASP.NET 6.4 is vulnerable to reflected cross-site scripting caused by improper validation of the Theme GET parameter in colorpicker_more.aspx. A remote, unauthenticated attacker can craft a URL that, once opened by a victim in a browser session authenticated to a site running the vulnerable component, executes arbitrary JavaScript in the security context of that site.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.