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How to Prevent Insider Threats

Delivers actionable strategies and best practices for preventing insider threats across organizations of all sizes. Articles cover access controls, employee vetting, security culture development, continuous monitoring, incident response planning, and policy frameworks designed to stop threats from within.

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Insider Threats

How to Prevent Insider Threats: A Practical Guide

In May 2022, a Yahoo research scientist named Qian Sang downloaded roughly 570,000 pages of proprietary source code to his personal devices — minutes after receiving a job offer from a competitor. Yahoo's internal systems flagged it, but only after the data had already left. That incident is

Carl B. Johnson Jun 12, 2025 7 min read
Insider Threats

How to Prevent Insider Threats: A Practical Guide

In January 2023, a former Tesla employee leaked the personal information of over 75,000 people — names, Social Security numbers, financial records — to a foreign news outlet. Tesla confirmed the breach wasn't caused by a sophisticated threat actor or a zero-day exploit. It was an insider. If you&

Carl B. Johnson Dec 09, 2023 7 min read
Insider Threats

How to Prevent Insider Threats: A Practical Guide

In December 2020, a former Cisco employee pleaded guilty to accessing the company's cloud infrastructure and deleting 456 virtual machines, wiping out 16,000 Webex Teams accounts. He'd left the company months earlier. His credentials still worked. That single insider incident cost Cisco roughly $2.4

Carl B. Johnson Jan 15, 2022 6 min read
Insider Threats

How to Prevent Insider Threats: A Practical Guide

In July 2020, a 17-year-old in Florida convinced a Twitter employee to hand over internal tool credentials. Within hours, threat actors had hijacked high-profile accounts — Barack Obama, Elon Musk, Apple — and ran a Bitcoin scam that netted over $100,000. The breach didn't start with a zero-day exploit

Carl B. Johnson Dec 20, 2020 7 min read
Insider Threats

How to Prevent Insider Threats Before They Cost Millions

In 2022, a former employee at Cash App's parent company, Block Inc., downloaded reports containing the personal information of over 8 million customers — months after they'd left the company. The access was never revoked. No alarm was triggered. The breach wasn't discovered until the

Carl B. Johnson Oct 01, 2019 7 min read