A vulnerability has been found in UmbracoForms (version now known) and classified as critical. This vulnerability affects some unknown processing of the component File Upload Handler. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

This affects all versions of package UmbracoForms. When using the default configuration for upload forms, it is possible to upload arbitrary file types.
 
 The package offers a way for users to mitigate the issue. The users of this package can create a custom workflow and frontend validation that blocks certain file types, depending on their security needs and policies.

The weakness was presented 07/28/2020 (Website). The advisory is shared for download at snyk.io. This vulnerability was named CVE-2020-7685 since 01/21/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The best possible mitigation is suggested to be Workaround.

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