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@Jean-Philippe_Rey
OK I had a look at the different descriptors (Device desc, Config desc, Interface desc, Endpoint desc, ...) as well as the stmcdc.INF, and it appears that I am completely lost. I can't figure out if 2 configuration descriptors are used (one for each interface) or if only one configuration descriptor is used, thus enclosing both interfaces. I am not familiar enough with that USB stuff to pretend I will find a solution, but I read this (old) post where they managed to enumerate a VCP/HID device with an STM32.
I will continue to try to understand all that stuff anyway.