What is CVE-2025-59821?

CVE-2025-59821 is a medium-severity vulnerability in Dnnsoftware Dnn.platform, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2025-09-23.

How severe is CVE-2025-59821?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Dnnsoftware Dnn.platform

CVE-2025-59821

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (9.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Dnnsoftware Dnn.platform — versions < 10.1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-jc4g-c8ww-5738 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-59821?: CVE-2025-59821 is a medium-severity vulnerability in Dnnsoftware Dnn.platform, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2025-09-23.
How severe is CVE-2025-59821?: Medium severity. CVSS v3 base score is 6.5 out of 10.