A "rogue employee" refers to a person who works for a company but behaves in a bad and untrustworthy way, going against the rules and causing harm or trouble for the company. Full definition
Thousands of innocent people suffered, and families lost their livelihoods, as a result of the actions of a relatively small number of rogue employees. (thebusinesscouncil.ca)
Sometimes they're the result of hackers and dataminers, other times they're caused by rogue employees or contractors, and occasionally they just happen by accident. (pcgamer.com)
The hidden backdoor, dubbed A2, could be inserted into chips during manufacturing by a single rogue employee, the researcher claim. (fortune.com)