CVE-2025-48378: 
C# vulnerability analysis and mitigation

DNN (formerly DotNetNuke), an open-source web content management platform in the Microsoft ecosystem, was found to be vulnerable to Cross-Site Scripting (XSS) attacks through SVG file uploads. The vulnerability (CVE-2025-48378) affects versions prior to 9.13.9 and was disclosed on May 23, 2025 (GitHub Advisory, NVD).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation) with a CVSS v4.0 base score of 6.1 (Medium). The attack vector is network-based, with low attack complexity, requiring low privileges and passive user interaction. The vulnerability allows uploaded SVG files containing scripts to be executed when rendered inline within the DNN platform (GitHub Advisory, Wiz).

When exploited, this vulnerability enables attackers to execute malicious scripts through SVG files that are rendered inline within the DNN platform. While the vulnerability has no direct impact on the vulnerable system's confidentiality, integrity, or availability, it can lead to high confidentiality impacts on subsequent systems through cross-site scripting attacks (GitHub Advisory, Wiz).

The vulnerability has been patched in DNN Platform version 9.13.9. Users are advised to upgrade to this version or later to mitigate the risk. The fix involves implementing improved validation of SVG files to prevent script execution (GitHub Advisory, GitHub Commit).