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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: DNN CMS has a **Cross-Site Scripting (XSS)** flaw. ๐จ **Consequences**: Attackers can inject malicious scripts via the **Prompt module**.โฆ
๐ก๏ธ **Root Cause**: **CWE-79** (Improper Neutralization of Input). ๐ก๏ธ **Flaw**: The **Prompt module** fails to sanitize **raw HTML** returned by commands. It allows execution of untrusted scripts directly in the browser.โฆ
๐ฆ **Affected**: **DNN (DotNetNuke)** CMS. ๐ฆ **Versions**: All versions **prior to 10.1.0**. ๐ข **Vendor**: DNN Software (US). ๐ป **Platform**: ASP.NET based. โ ๏ธ Check your version number immediately!
Q4What can hackers do? (Privileges/Data)
๐ **Hackers Can**: Execute arbitrary JavaScript in victim's browser. ๐ **Privileges**: Act as the logged-in user. ๐ **Data**: Steal **cookies**, **tokens**, or **sensitive content**.โฆ
๐ต๏ธ **Public Exp?**: **No PoC provided** in data. ๐ต๏ธ **Wild Exp**: Unconfirmed. ๐ **Source**: GitHub Advisory (GHSA-2qxc-mf4x-wr29). ๐ **Published**: 2025-09-23. โ ๏ธ Assume it *could* be exploited if the module is active.
Q7How to self-check? (Features/Scanning)
๐ **Self-Check**: Scan for **DNN CMS** signatures. ๐ **Feature**: Look for active **Prompt module** usage. ๐ **Tools**: Use DAST scanners for **XSS** in input fields. ๐ **Verify**: Check version < **10.1.0**.โฆ
๐ง **No Patch?**: Disable the **Prompt module** entirely. ๐ง **Workaround**: Implement **strict input validation** and **output encoding** (HTML Entity Encode). ๐ง **WAF**: Block raw HTML tags in POST requests.โฆ