Security
How to Prevent Data Breaches in 8 Ways
Anthon Wansland
CMO & Founder
5 min
read
Data breaches rarely begin with drama. They begin with small gaps.
A reused password.
An unpatched system.
A convincing email.
A file shared with the wrong person.
In this guide, we explain what a data breach is, how data breaches happen, the most common causes, and how to reduce exposure.
At Serus, we believe effective cybersecurity starts with clarity. You cannot protect what you do not understand.
Definition: What Are Data Breaches?
A data breach is when confidential, private, protected, or sensitive information is accessed, exposed, stolen, or shared by someone who is not authorized to see it.
This can happen through:
Human error
Weak security controls
Malicious insiders
Targeted cyberattacks
Lost or stolen devices
A data breach may affect individuals, teams, or entire organizations. The exposed information can include login credentials, financial records, customer data, health data, internal business documents, or other sensitive assets.
Some breaches are accidental. Others are deliberate. The result is the same: information ends up in the wrong hands.
7 Types of Data Breaches
Data breaches do not always happen in the same way. Some are accidental. Others are intentional. Understanding the type of breach makes it easier to prevent the next one.
Accidental breaches: Accidential breaches happen when sensitive information is exposed by mistake. Common examples include sending a file to the wrong person, sharing data with the wrong permissions, or leaving cloud storage open.
Insider breaches: An insider breach involves someone with legitimate access, such as an employee or contractor. The person may misuse data intentionally or handle it carelessly.
Credential-based breaches: Credential-based breaches happen when attackers gain access through stolen, weak, or reused login details. They often begin with phishing, password reuse, or leaked credentials.
Malware-based breaches: Malware can be used to steal data, monitor activity, or create access inside a system. This often starts when someone opens a harmful attachment or clicks a malicious link.
Vulnerability-based breaches: Vulnerability-based breaches happen when attackers exploit weaknesses in software, systems, or infrastructure. Unpatched software and insecure configurations are common entry points.
Physical breaches: Not all breaches happen online. A lost laptop, stolen phone, or misplaced USB drive can also expose sensitive data, especially if it is not encrypted.
Third-party breaches: A breach can also happen through a vendor or external partner. If a third party has access to sensitive data or systems, their weaknesses can become yours too.
> Read more: Understand the different types of exposure
How Do Data Breaches Happen?
A data breach is rarely a single, isolated event. It is usually a multi-step process where an attacker methodically looks for the weakest link. By understanding this flow, organizations can break the chain before the damage is done.
Step 1 – Reconnaissance: The attacker gathers information about the target. This might involve harvesting employee emails from LinkedIn or identifying which software versions the company is running.
Step 2 – Initial Access: This is the "hole in the fence." It typically happens through a phishing email, a guessed password, or by exploiting a known vulnerability in unpatched software.
Step 3 – Lateral Movement: Once inside, attackers don’t stop at the entry point. They move through the network to find higher-value data and escalate their privileges, like gaining administrator rights.
Step 4 – Exfiltration: Finally, the data is copied or moved to the attacker’s own servers. This is the moment the "leak" officially occurs.
Common Causes of a Data Breach
Statistics show that most breaches aren't the result of technical genius, but rather basic security oversights.
The human element: Over 80% of breaches involve a human component, such as clicking a malicious link or accidentally sending sensitive data to the wrong recipient.
Weak or reused passwords: If a password leaks from a minor service, attackers use it to try and log into more critical business systems (a technique known as credential stuffing).
Unpatched software: Systems that aren't updated leave the door open for known security holes that hackers can easily exploit with automated tools.
Shadow IT: When employees use unauthorized apps or cloud services to handle company data, it moves outside the control and protection of the IT department.
8 Ways to Prevent Data Breaches
Effective prevention is about building defense in depth. Here are eight steps to minimize your exposure.
Step 1: Enable Multi-Factor Authentication (MFA)
MFA is the single most effective defense. Even if an attacker steals a password, they are blocked at the next step. Use authentication apps or physical security keys rather than SMS codes for better security.
Step 2: Implement a Strict Password Policy
Human-generated passwords are often predictable. Require the use of password managers and unique, complex passwords for every service. No password should ever be reused across different platforms.
Step 3: Automate Security Patching
Make it a rule that all systems, servers, and applications are updated immediately when a patch is released. Automation removes the risk of human forgetfulness leaving a critical vulnerability exposed.
Step 4: Continuous Employee Training
Security is a perishable skill. Conduct regular training on how to recognize phishing and social engineering. A vigilant employee is often your best line of defense.
Step 5: Apply the Principle of Least Privilege (PoLP)
Never give employees more access to data than they absolutely need to perform their jobs. If an account is compromised, the damage is limited if that account only has access to a small segment of the system.
Step 6: Encrypt Sensitive Data
Data should be unreadable to unauthorized parties, both when stored (at rest) and when being sent (in transit). If a breach does occur, encrypted data remains useless to the attacker.
Step 7: Conduct Regular Security Audits
Don’t wait for a breach to find your weaknesses. Perform regular vulnerability scans and penetration tests to proactively close gaps in your defense.
Step 8: Use AI-Driven Monitoring and Data Minimization
The less data you hold, the less can be leaked. Use tools like Serus to gain control over your digital exposure, identify where sensitive data lives, and automatically remove information that is no longer needed.
> Also read: How to remove search results about you from Google
Consequences of Data Breaches
A data breach is not just measured in lost files. It impacts the very foundation of a business.
Financial loss: The costs of recovery, legal fees, and potential ransoms can be astronomical.
Legal penalties: Under laws like GDPR, companies can face heavy fines if they fail to protect personal data.
Reputational damage: It takes years to build a brand, but only minutes to lose the trust of customers and partners after a leak.
Operational downtime: A breach can paralyze an entire organization for days or weeks, leading to lost revenue and missed opportunities.
From Reactive to Proactive With Serus
Data breaches are a reality of the digital age, but they are not inevitable. By shifting focus from simply reacting to incidents to proactively closing the "small gaps," you build a resilient organization.
Security is ultimately about control. By understanding your exposure and acting with precision, you can protect what matters most: your data and your customers' trust.
Want to know how exposed your organization is? Serus helps you monitor your digital footprint and take control of your privacy online.
> Welcome to Serus: The privacy platform we’ve always needed
