DNN (formerly DotNetNuke) is an open-source web content management platform (CMS) in the Microsoft ecosystem. Starting in version 6.0.0 and prior to version 10.2.2, in the friends feature, a user could craft a request that would force the acceptance of a friend request on another user. Version 10.2.2 patches the issue.
https://github.com/dnnsoftware/Dnn.Platform/security/advisories/GHSA-fpj4-9qhx-5m6m
https://github.com/dnnsoftware/Dnn.Platform/releases/tag/v10.2.2