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DNN Insufficient Access Control - Image Upload allows for Site Content Overwrite

Critical severity GitHub Reviewed Published Oct 28, 2025 in dnnsoftware/Dnn.Platform • Updated Oct 29, 2025

Package

nuget DNN.PLATFORM (NuGet)

Affected versions

< 10.1.1

Patched versions

10.1.1

Description

Summary

The default HTML editor provider allows unauthenticated file uploads and images can overwrite existing files.

Description

An unauthenticated user can upload and replace existing files allowing defacing a website and combined with other issue, injection XSS payloads.

References

@valadas valadas published to dnnsoftware/Dnn.Platform Oct 28, 2025
Published by the National Vulnerability Database Oct 28, 2025
Published to the GitHub Advisory Database Oct 29, 2025
Reviewed Oct 29, 2025
Last updated Oct 29, 2025

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(19th percentile)

Weaknesses

Unrestricted Upload of File with Dangerous Type

The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Learn more on MITRE.

CVE ID

CVE-2025-64095

GHSA ID

GHSA-3m8r-w7xg-jqvw

Source code

Credits

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