CVE-2020-37103 DotNetNuke 9.5 - Persistent Cross-Site Scripting
Attackers can upload malicious XML files to execute arbitrary JavaScript in users' browsers, potentially bypassing CSRF protections.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-37103?
CVE-2020-37103 is a medium-severity cross-site scripting vulnerability in Dnnsoftware Dotnetnuke, published on 3 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
DotNetNuke 9.5 contains a persistent cross-site scripting vulnerability that allows normal users to upload malicious XML files with executable scripts through journal tools. Attackers can upload XML files with XHTML namespace scripts to execute arbitrary JavaScript in users' browsers, potentially bypassing CSRF protections and performing more damaging attacks.
Weakness: CWE-79
Which versions are affected by CVE-2020-37103?
It affects 1 product.
Products include Dnnsoftware Dotnetnuke.
How do I fix CVE-2020-37103?
No fix has been published for CVE-2020-37103 yet. Limit exposure of the affected software until one is available.
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-2020-37103 being exploited?
There is no known exploitation of CVE-2020-37103 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-mwcw-c9qw-pvc9.