Persistent Cross-Site Scripting Vulnerability in DotNetNuke 9.5 by DNN Software
CVE-2020-37103

5.1MEDIUM

Key Information:

Vendor

Dnnsoftware

Status
Dotnetnuke
Vendor
CVE Published:
3 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37103?

DotNetNuke 9.5 is susceptible to a persistent cross-site scripting (XSS) vulnerability that allows attackers to upload harmful XML files containing executable scripts through the journal tools. This vulnerability permits normal users to upload files with XHTML namespace scripts, which can trigger arbitrary JavaScript execution in the browsers of unsuspecting users. This poses a significant risk as attackers may exploit it to bypass existing CSRF protections, leading to more severe security issues within the affected applications.

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Affected Version(s)

DotNetNuke 0 <= 9.5

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2020-37103 - Proof of Concept

References

https://www.exploit-db.com/exploits/48124
exploit
http://dnnsoftware.com/
product
https://medium.com/@SajjadPourali/dnn-dotnetnuke-cms-not-...
technical-description

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sajjad Pourali
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