What is the CVSS score of CVE-2020-37103?

CVE-2020-37103 has a CVSS 3.1 base score of 6.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of .NET are affected by CVE-2020-37103?

Organizations using DotNetNuke 9.5 should be aware of moderate risk from CVE-2020-37103, a cross-site scripting vulnerability rated CVSS 6.4.

Is there a public PoC exploit available for CVE-2020-37103?

Yes, a public proof-of-concept exploit is available for CVE-2020-37103. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2020-37103?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

.NET CVE-2020-37103

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-03 disclosure@vulncheck.com

.NET XSS CSRF Dotnetnuke

6.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.4 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Feb 09, 2026 - 22:10 vuln.today

Public exploit code

CVE Published

Feb 03, 2026 - 18:16 nvd

MEDIUM 6.4

DescriptionCVE.org

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.

AnalysisAI

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. [CVSS 6.4 MEDIUM]

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Dotnetnuke. 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.

RemediationAI

Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.

CVE-2020-37103 vulnerability details – vuln.today

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