Do you struggle with how to spell a word prefixed with "cyber"? In everything you read on cyber-subjects, you will see a variety of spelling styles. Spell checkers haven't come to grips with the correct spelling either, and some will flag all the following forms as spelling errors:
cybersecurity; cyber security; cyber-security
What is fact is that, linguistically, "cyber" is not word on its own. It only has meaning as a prefix. It follows then that the use of "cyber" followed by a space (cyber security) is always incorrect.