CVE-2025-64095: DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 47.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-10-28 · updated 2026-10-18
Weakness: CWE-434

Description

DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to 10.1.1, the default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files. An unauthenticated user can upload and replace existing files allowing defacing a website and combined with other issue, injection XSS payloads. This vulnerability is fixed in 10.1.1.

Affected products

DotNetNuke CMS Fixed in 9.1.1: before 10.1.1 — fixed in 10.1.1

How to fix

Upgrade to a fixed version: DotNetNuke CMS Fixed in 9.1.1 10.1.1. Check the vendor advisory for mitigations.

References

https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-3m8r-w7xg-jqvw

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