Glossary
Insider Threat
An insider threat is when the danger comes from inside your own team. It could be a disgruntled employee stealing data before they quit, a careless worker clicking on a phishing email, or a contractor accessing systems they shouldn't. These threats are hard to detect because the person already has the keys to the building.
What is Insider Threat?
An insider threat comes from people within an organization - employees, contractors, or partners - who misuse their legitimate access to harm the business. This can be intentional (theft, sabotage) or unintentional (accidents, falling for phishing). Insiders already have access past your security perimeter.
Why Should You Care?
Insider threats cause an estimated 60% of data breaches. They're particularly dangerous because insiders know your systems, have legitimate access, and can bypass external security measures. The average insider breach costs over $15 million. Most small businesses focus entirely on external threats and ignore this risk.
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Real-World Example
An IT administrator at a financial services firm was passed over for promotion. Over the following months, they quietly copied client databases and sold the data to competitors. By the time the breach was discovered, 50,000 client records had been exposed. The firm faced regulatory fines and lost several major clients.
How to Protect Against Insider Threat
- 1.
Implement the principle of least privilege - minimum access needed for the job
- 2.
Immediately revoke access when employees leave (same day)
- 3.
Monitor and log access to sensitive data
- 4.
Review access permissions quarterly
- 5.
Create clear policies about data handling and acceptable use
- 6.
Consider user behavior analytics for high-risk environments
Related Terms
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