CVE-2025-59547 DNN's CKEditor File Uploader functionality vulnerable through Unicode obfuscation

Medium 5.3 Published 23 Sep 2025 Updated 23 Sep 2025

Attackers can exploit insufficient filename sanitization in DNN's CKEditor uploader to probe internal network resources via Unicode obfuscation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-59547?

CVE-2025-59547 is a medium-severity server-side request forgery vulnerability in Dnnsoftware Dotnetnuke, published on 23 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, the CKEditor file upload endpoint has insufficient sanitization for filenames allowing probing network endpoints. A specially crafted request can be made to upload a file with Unicode characters, which would be translated into a path that could expose resources in the internal network of the hosted site. This issue has been patched in version 10.1.0.

Weakness: CWE-176

Which versions are affected by CVE-2025-59547?

It affects 1 product.

Products include Dnnsoftware Dotnetnuke.

How do I fix CVE-2025-59547?

No fix has been published for CVE-2025-59547 yet. Limit exposure of the affected software until one is available.

Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.

Is CVE-2025-59547 being exploited?

There is no known exploitation of CVE-2025-59547 in the wild and no public exploit code.

All Dnnsoftware Dotnetnuke vulnerabilities

Sources

Also known as GHSA-cgqj-mw4m-v7hp.