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The CVE-2025-XXXXX vulnerability in DNN Platform stems from an insufficient access control mechanism within the default HTML editor provider. This component improperly handles file upload requests, failing to validate the user’s authentication state or authorization level. Specifically, the endpoint responsible for processing image uploads does not verify if the requesting party is a logged-in user with appropriate privileges. Furthermore, the upload functionality lacks critical security checks, such as validating whether a file with the target filename already exists on the server. An attacker can craft a direct HTTP POST request to the vulnerable endpoint, specifying the path and filename of an existing system file. By sending a maliciously crafted image or text file, the attacker can overwrite critical web content, such as .aspx pages or configuration files. This allows for complete site defacement or, by overwriting a page with an XSS payload, the injection of client-side scripts that execute in the browsers of subsequent visitors.
Platform: DNN Platform
Version: Pre-patch versions
Vulnerability: Insufficient Access Control
Severity: Critical
date: 2025-10-28
Prediction: 2025-11-11
What Undercode Say:
`curl -X POST -F “file=@malicious_image.png” http://
`POST /API/InternalServices/FileUpload/UploadFile HTTP/1.1`
`Host: victim.com`
`Content-Type: multipart/form-data; …`
`…`
`–boundary`
`Content-Disposition: form-data; name=”file”; filename=”../../Default.aspx”`
`Content-Type: image/png`
`<% ...malicious code... %>`
How Exploit:
Unauthenticated file upload
Path traversal for overwrite
Website defacement achieved
Protection from this CVE:
Apply vendor patch
Restrict upload directory permissions
Implement file hash verification
Impact:
Site content overwrite
Persistent XSS injection
Complete website compromise
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Sources:
Reported By: github.com
Extra Source Hub:
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