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CVE-2021-3030

MediumPublished

Cute Editor for ASP.NET 6.4 is vulnerable to reflected cross-site scripting caused by improper validation of the Theme GET parameter in...

Published: Sep 17, 2026
Updated: Sep 18, 2026
Assigning CNA: mitre
Evidence observed: Sep 6, 2026

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 24.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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 victim in a browser session authenticated to a site running the vulnerable component, executes arbitrary JavaScript in the security context of that site.

Sources

CVE-2021-3030PoC
Advisory: Cute Editor 6.4 reflected XSS via 'Theme' parameter in colorpicker_more.aspx

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