CVE-2025-62802: 
C# vulnerability analysis and mitigation

DNN (formerly DotNetNuke), an open-source web content management platform in the Microsoft ecosystem, was found to contain a security vulnerability in its HTML editing functionality prior to version 10.1.1. The vulnerability (CVE-2025-62802) allows unauthenticated users to upload files through the CKEditor Provider, creating potential security risks in the default configuration (GitHub Advisory).

The vulnerability has been assigned a CVSS v3.1 score of 4.3 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N. This indicates that the vulnerability is network-accessible, requires low attack complexity, needs no privileges, but does require user interaction. The scope is unchanged, with no impact on confidentiality, low impact on integrity, and no impact on availability (GitHub Advisory, Miggo).

The vulnerability exposes implementations to potential security issues through unauthorized file uploads. While the direct impact is rated as low, it creates a potential vector for other security issues in systems using the default configuration (GitHub Advisory).

The vulnerability has been fixed in version 10.1.1, which blocks the endpoint for unauthenticated users by default. For implementations requiring unauthenticated uploads, administrators can modify the web.config file to remove the block and allow public access to the endpoint (GitHub Advisory).