CVE-2025-59821 DNN vulnerable to Reflected Cross-Site Scripting (XSS) using url to profile
Attackers can inject malicious scripts into user profiles via crafted URLs, allowing execution in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-59821?
CVE-2025-59821 is a medium-severity cross-site scripting vulnerability in Dnnsoftware Dotnetnuke, published on 23 Sep 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Prior to version 10.1.0, DNN’s URL/path handling and template rendering can allow specially crafted input to be reflected into a user profile that is returned to the browser. In these cases, the application does not sufficiently neutralize or encode characters that are meaningful in HTML, so an attacker can cause a victim’s browser to interpret attacker-controlled content as part of the page’s HTML. This issue has been patched in version 10.1.0.
Weakness: CWE-79
Which versions are affected by CVE-2025-59821?
2 open source packages ship an affected version, including DotNetNuke.Core. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
DotNetNuke.Core NuGet | All versions | 10.1.0 |
DotNetNuke.Core NuGet | All versions | 10.1.0 |
Products include Dnnsoftware Dotnetnuke.
How do I fix CVE-2025-59821?
Upgrade DotNetNuke.Core to 10.1.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-59821 being exploited?
There is no known exploitation of CVE-2025-59821 in the wild and no public exploit code.
Other vulnerabilities in Dnnsoftware Dotnetnuke
- CVE-2017-9822 DotNetNuke (DNN) Remote Code Execution
- CVE-2018-15811 DotNetNuke (DNN) Inadequate Encryption Strength
- CVE-2018-18325 DotNetNuke (DNN) Inadequate Encryption Strength
- CVE-2025-64095 DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite
- CVE-2006-3601 Privilege escalation in n/a
Sources
Also known as GHSA-jc4g-c8ww-5738.