WordPress suddenly has more strange plugins in the backend, is it being invaded?

Careful judgment is required. Some hosts or themes may come with plug-ins automatically installed, but if the source of the plug-ins is unknown, immediate troubleshooting is required. You should check whether the recent login record, administrator account is abnormal, and check the plug-in file creation time. It is also recommended to change the background password, database prefix, and perform a complete security scan to prevent potential backdoor risks.