CVE-2025-59546: 
C# vulnerability analysis and mitigation

CVE-2025-59546 affects DNN (formerly DotNetNuke), an open-source web content management platform in the Microsoft ecosystem. The vulnerability was discovered and disclosed on September 23, 2025, impacting versions prior to 10.1.0. The issue allows administrators and content editors to set HTML in module titles that could include JavaScript, potentially enabling XSS-based attacks (GitHub Advisory).

The vulnerability is classified as a Stored Cross-Site Scripting (XSS) issue, identified as CWE-79 (Improper Neutralization of Input During Web Page Generation). It has been assigned a CVSS 3.1 Base Score of 2.4 (Low) with the vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N. This indicates that while the vulnerability is network-accessible, it requires high privileges and user interaction to exploit, with limited impact confined to integrity (GitHub Advisory).

The vulnerability allows privileged users to inject malicious JavaScript code through module titles, which could be used for XSS-based attacks. While HTML in module titles could be a valid use case, the security implications arise from the potential for malicious script injection. The impact is somewhat limited due to the high privileges required for exploitation (GitHub Advisory).

The vulnerability has been patched in DNN version 10.1.0. Additionally, a security setting has been added in the Security module within the Persona Bar to control this functionality. Users are advised to upgrade to version 10.1.0 or later to address this security issue (GitHub Advisory).