CVE-2025-59546 Overview
CVE-2025-59546 is a stored cross-site scripting (XSS) vulnerability [CWE-79] affecting DNN Platform (formerly DotNetNuke), an open-source content management system built on the Microsoft .NET ecosystem. The flaw allows administrators and content editors to insert HTML — including executable JavaScript — into module titles. When other users render pages containing the affected modules, the injected script executes in their browser context. The vendor patched the issue in version 10.1.0.
Critical Impact
Authenticated users with content-editing privileges can inject persistent JavaScript into module titles, enabling session theft, UI redress, or privileged action abuse against other DNN users.
Affected Products
- DNN Platform (DotNetNuke) versions prior to 10.1.0
- DNN sites allowing module title editing by administrators or content editors
- Self-hosted DNN installations in the Microsoft .NET/IIS ecosystem
Discovery Timeline
- 2025-09-23 - CVE-2025-59546 published to the National Vulnerability Database
- 2026-10-11 - Last updated in NVD database
Technical Details for CVE-2025-59546
Vulnerability Analysis
The vulnerability resides in how DNN Platform handles module title input submitted by privileged users. The application accepts raw HTML for module titles and renders it back into pages without sanitizing or encoding script-bearing payloads. Any user visiting a page containing the tampered module executes the stored payload under the site's origin.
Because the injection occurs server-side and persists in module metadata, the payload executes for every subsequent page view. This classifies the issue as stored (persistent) XSS, which carries more operational risk than reflected variants. Exploitation requires high privileges (administrator or content editor) and user interaction from the victim.
Root Cause
DNN's module title rendering path does not apply output encoding or an HTML allow-list filter before writing titles into the page document. The platform implicitly trusted privileged roles with raw HTML, violating the principle that even trusted input must be contextually encoded when echoed into a browser response.
Attack Vector
An attacker who has obtained administrator or content editor credentials, or who has compromised such an account, edits a module and sets its title to a value containing a <script> element or an event-handler attribute such as onerror. Each subsequent visitor to the affected page triggers the payload. The injected script runs with the full DOM access of the DNN site, enabling cookie theft, CSRF against authenticated endpoints, and lateral movement into higher-privileged accounts that view the same page.
No verified public exploit code is available. See the GitHub Security Advisory GHSA-gj8m-5492-q98h for vendor-maintained technical details.
Detection Methods for CVE-2025-59546
Indicators of Compromise
- Module title fields containing <script>, javascript:, or inline event handlers such as onerror=, onload=, or onmouseover=
- Audit log entries showing module edits from administrator or editor accounts at unusual times or from unexpected IP addresses
- Outbound requests from user browsers to attacker-controlled domains originating from DNN-hosted pages
- Unexpected session token exfiltration or cookie access in web application firewall telemetry
Detection Strategies
- Query the DNN content database for module title columns containing HTML tags or JavaScript URI schemes
- Enable DNN audit logging for module edits and correlate with authentication events for privileged accounts
- Deploy a web application firewall rule that flags HTML or script syntax submitted to module management endpoints
- Review page HTML responses in staging environments for script content originating from title fields
Monitoring Recommendations
- Monitor DNN administrator and editor account activity for anomalous login locations and off-hours module edits
- Alert on Content Security Policy violation reports that reference inline scripts from DNN-served pages
- Track changes to module metadata tables through database activity monitoring
How to Mitigate CVE-2025-59546
Immediate Actions Required
- Upgrade all DNN Platform instances to version 10.1.0 or later without delay
- Audit existing module titles across every portal and remove any entries containing HTML or script syntax
- Rotate credentials and session tokens for administrator and content editor accounts if tampering is suspected
- Enforce multi-factor authentication on all DNN privileged roles to reduce the risk of credential-based abuse
Patch Information
The DNN project resolved CVE-2025-59546 in DNN Platform version 10.1.0. Refer to the DNN Platform GitHub Security Advisory GHSA-gj8m-5492-q98h for release notes and upgrade guidance.
Workarounds
- Restrict module editing permissions to the minimum set of trusted users until the patch is applied
- Deploy a Content Security Policy that disallows inline scripts to limit the impact of injected payloads
- Place a web application firewall in front of DNN with rules that block HTML tags in module title parameters
- Review and remove unused administrator or editor accounts to shrink the attack surface
# Example Content-Security-Policy header to mitigate inline script execution
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; report-uri /csp-report
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
