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The CVE-2025-45431 vulnerability exists in the default configuration of the DNN CKEditor Provider. Out-of-the-box, the platform exposes a file upload endpoint intended for use with the HTML editor. This endpoint fails to perform any authentication checks, allowing any remote, unauthenticated user to upload arbitrary files to the server. While the impact is moderated by the fact that uploaded files are typically stored in a non-executable directory, it creates a significant security weakness. This flaw provides a direct vector for attackers to upload malicious scripts or oversized files, potentially leading to denial-of-service conditions or serving as a stepping stone for further attacks if combined with other vulnerabilities. The core issue is that this functionality, which is not required by most implementations, is enabled by default without proper access controls.
Platform: DNN CKEditor Provider
Version: Out-of-box
Vulnerability : Unauthenticated File Upload
Severity: Moderate
date: 2025-10-28
Prediction: 2025-11-11
What Undercode Say:
`curl -X POST -F “[email protected]” http://[bash]/DesktopModules/CKEditorProvider/FileUploadHandler.ashx`
`wget –post-file=large_file.zip http://[bash]/DesktopModules/CKEditorProvider/FileUploadHandler.ashx`
How Exploit:
Attackers use automated tools or simple scripts to send HTTP POST requests to the vulnerable FileUploadHandler.ashx endpoint. They can upload web shells, malware, or excessively large files to fill disk space without requiring any login credentials.
Protection from this CVE:
Apply vendor patch. Modify web.config to block unauthenticated access to the FileUploadHandler.ashx endpoint. Disable the endpoint if unauthenticated uploads are not required.
Impact:
Arbitrary file upload. Denial-of-service. Security foothold establishment.
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Sources:
Reported By: github.com
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