DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite
Date: 2025-10
Affected: nuget/DNN.PLATFORM
Attack vector: xss
Category: vulnerability-disclosure
Severity: Critical
CVE: CVE-2025-64095
CWE: CWE-434
CVSS: 10 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

### Summary The default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files. ### Description An unauthenticated user can upload and replace existing files allowing defacing a website and combined with other issue, injection XSS payloads.


Mitigations:

Architectural layers (MAESTRO):