USBSerial bitrate capped at 9600

Hi,
I needed some guidance, please. I have a custom board derived from Nucleo_L452 with an USB FS connected to the PC. USBSerial interface is used to communicate.

Everything works perfectly - when I connect the device to PC, windows/Linux recognizes the device as virtual serial port and I can use PuTTY/screen to communicate.

The problem is the bit rate is always 9600 no matter what I try to set in the windows driver or putty. In Linux it behaves the same way. I need 115200 optimally, nothing fancy, just that 9600 is too slow to render some tables with continually updated values.

Do you have a clue?

Thanks