Human Errors in Cyber Security: 5 Common Mistakes Caused by Employees

Cybersecurity must be a top priority for any organization handling sensitive information. Many firms invest heavily in tools to protect against external threats, while human-error-related internal risks are comparatively under-resourced. That's a mismatch worth correcting: human error accounts for roughly a quarter of data breaches on its own, and the human element in some form — error, manipulation, or misuse — factors into the majority of breaches overall, according to Verizon's 2025 Data Breach Investigations Report. Here are five of the most common employee mistakes still driving that number.

1. Weak Passwords

Employees often reuse passwords or choose easily guessable ones — pet names, birthdays, family members — making credential-based attacks trivial. Organizations should enforce complexity requirements, rotation policies, and multi-factor authentication as a baseline, not an option. See our breakdown of password cracking techniques and tools to understand exactly what a weak password is up against.

What makes a password strong:

1. Mix of uppercase and lowercase letters
2. Numbers and symbols worked in naturally, not just appended
3. At least 12 characters — longer passphrases are both harder to crack and easier to remember

2. Phishing Attacks

Phishing remains the most common way attackers trick employees into revealing credentials or sensitive data, and generative AI has made these attempts noticeably harder to spot — well-written, personalized, and increasingly voice- or video-assisted.

Common variants:

1. Email phishing — mass emails impersonating a legitimate sender
2. Spear phishing — targeted, personalized attempts aimed at a specific individual
3. Vishing — voice-based phishing over phone calls
4. Whaling — targeting executives specifically, often to authorize fraudulent transfers
5. Malware-based phishing — using attachments or malicious links to deliver malware directly

3. Unauthorized Access

Employees sometimes access data they aren't authorized to view — out of carelessness, curiosity, or occasional malice. Role-based access controls and regular access log reviews catch this before it becomes a real incident.

4. Social Engineering

Social engineering manipulates people rather than systems — pretexting, baiting, and quid pro quo tactics all rely on exploiting trust and urgency. The best defense is the same as with phishing: structured, repeated training that builds recognition, not a one-time policy memo. This is exactly the gap between generic "awareness" and something measurable — see why ongoing training outperforms annual check-the-box sessions.

5. Unsecured Devices

Personal laptops and mobile devices used to access company data typically lack the security controls of managed hardware. Policies that restrict the use of these unsecured devices — and enforce the use of company-provided, properly configured devices — close this gap.

Human error remains one of the largest, most consistent threats to organizational cybersecurity — and unlike a zero-day exploit, it's also one of the most directly addressable through training, policy, and access controls working together. For the fuller policy picture, see Cybersecurity in the Workplace: Best Practices for Employers and Employees.

Want to move from generic awareness training to a measurable human risk program? Explore Cyberyami's Human Risk Management platform.

Related Reads

1. Ways to Protect Your Business from Cyber Threats
2. Cybersecurity in the Workplace: Best Practices for Employers and Employees
3. Why Employee Awareness Training Is Your Cheapest Insurance Policy
4. The Art of Password Cracking: Techniques and Tools Explained