What’s Vulnerable › Vulnerabilities

CVE-2025-59535: DotNetNuke.Core allows loading of unused themes on anonymous clients through query parameters

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-22 · updated 2026-10-11
• Weakness: CWE-20

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.

Affected products

• DotNetNuke CMS Fixed in 9.1.1: before 10.1.0 — fixed in 10.1.0

How to fix

Upgrade to a fixed version: DotNetNuke CMS Fixed in 9.1.1 10.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/dnnsoftware/Dnn.Platform/blob/develop/DNN%20Platform/Library/UI/Skins/Skin.cs#L305
• https://github.com/dnnsoftware/Dnn.Platform/commit/72f30f69fd2214d77f6c2577dfcca495a24caf5c
• https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-wq2j-w9pm-7x2p

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