CVE-2025-59535: dotnetnuke Input Validation Flaw — Fix

Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, arbitrary themes can be loaded through query parameters. If an installed theme had a vulnerability, even if it was not used on any page, this could be loaded on unsuspecting clients without knowledge of the site owner. This issue has been patched in version 10.1.0.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-20 Improper Input Validation

CWE-200 CWE-200

CWE-829 CWE-829

Affected Products

Vendor	Product	Versions
dnnsoftware	dotnetnuke	< 10.1.0

References

Advisories & Patches

https://github.com/dnnsoftware/Dnn.Platform/commit/72f30f69fd2214d77f6c2577dfcca495a24caf5c https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-wq2j-w9pm-7x2p

Other References

https://github.com/dnnsoftware/Dnn.Platform/blob/develop/DNN%20Platform/Library/UI/Skins/Skin.cs#L305

Frequently Asked Questions

What is CVE-2025-59535? +

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, arbitrary themes can be loaded through query parameters. If an installed theme had a vulnerability, even if it was not used on any page, this could be loaded on unsuspecting clients without knowledge of the site owner. This issue has been patched in version 10.1.0. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-59535? +

CVE-2025-59535 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-59535? +

CVE-2025-59535 affects products from dnnsoftware, specifically: dotnetnuke. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-59535? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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