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Preventing data breaches is at the core of cybersecurity professionals’ work. The potential cost of a data breach is a driving force behind organizations’ desire to prioritize data breach prevention. IBM reports that the average cost of a breach was $4.45 million in 2023.

Besides the financial impact of a data breach on the organization, individuals whose data is accessed also can face financial difficulties. For example, around April 8, 2024, a single breach of the background check firm National Public Data exposed the private records of an estimated 2.9 billion U.S. citizens and resulted in that information being available for sale on the dark web. For the individuals whose data was included, the exposure created immediate risks of identity theft and financial fraud, with consequences that may not surface until years later.

Cybersecurity professionals or individuals looking to enter this field should understand what a data breach is, how they occur, and what the most effective data breach prevention strategies are.

What Is a Data Breach, and Why Is It Important?

Of all the cybersecurity vulnerabilities organizations are concerned about, a data breach is one of the most serious. Actors who breach the systems of organizations can potentially gain access to their employees’ login credentials as well as their customers’ personal information, their proprietary financial information, or their intellectual property. This can put individuals and organizations at risk of great harm.

The damage from a data breach can be significant, and stopping an attack can take a long time. It requires an average of 277 days to identify and mitigate a data breach, according to IBM. Data breaches have affected millions of people. The World Economic Forum’s 2026 global cybersecurity survey found that 73% of participants said they or someone they know professionally had been affected by cyber-enabled fraud in the previous year.

Common Causes of Data Breaches

One common root cause of data breaches is system vulnerabilities, such as outdated software. Another common cause is the success of phishing attacks, in which hackers get employees to click on a malicious link in an email or download software that can cause harm without their awareness.

Cybersecurity professionals employ data breach prevention strategies that include targeted controls and processes to tackle common causes of data breaches, such as the following:

Unpatched Vulnerabilities

One of many organizations’ primary cybersecurity vulnerabilities is the unpatched software in their systems. Organizations that haven’t recently updated their systems or authentication methods are a key target for cybercriminals. An IBM threat intelligence report states that 56% of disclosed software vulnerabilities can be exploited without authentication. Also of concern is the fact that attackers often can find a way to reverse-engineer a newly released patch to gain access to systems.

The federal government’s Cybersecurity and Infrastructure Security Agency (CISA) maintains a vulnerabilities catalog that tracks active exploitations of specific flaws. This catalog provides cybersecurity teams with timely information they can use to close high-risk gaps in their organizations’ systems.

Zero-Day Exploits

A zero-day exploit involves the use of malicious code, secretly installed on a targeted organization’s Microsoft Windows, Google Android, or Linux system, to enable future cyber attacks on the organization. Zero-day exploits are dangerous because they can remain hidden and strike at any time, and, as a result, there is typically no fix at the time of the attack.

Zero-day exploits also target systems used for enterprise networks and virtual private networks (VPNs). In 2025, Google’s zero-day review found that 48% of exploits targeted enterprise-level technology, a new high.

According to IBM’s overview of zero-day threats, the time between discovering a vulnerability and exploiting it is getting shorter, putting more pressure on cybersecurity teams to catch unusual activity early.

Phishing and Social Engineering

Phishing is a tactic in which cyber attackers pretend to be trusted sources. In the most common type of phishing attack, a cybercriminal sends an email that attempts to trick recipients into sharing their credentials, clicking on a harmful link, or approving a fake transaction. A phishing attack that directly targets a specific individual, known as a spear phishing attack, depends on information from data breaches, social media accounts, or public records to make the emails look more credible.

Recently, the use of artificial intelligence (AI) tools for phishing schemes has led to a significant increase, 202%, in email attacks, and has made phishing attacks more sophisticated and difficult to spot, according to Varonis.

Some phishing attackers target individuals in other ways. For example, short message service (SMS) phishing, known as smishing, employs fake text messages, while voice phishing, or vishing, uses fake phone calls.

Insider Threats

Employees, contractors, and partners with legitimate credentials and access to an organization’s systems can perform everyday actions that can cost the organization money without anyone knowing about it. These insider threats can be intentional or unintentional, but either way they can hurt an organization’s reputation and use up its resources.

Fortinet reports that 77% of businesses lost data because of insiders between 2024 and 2025. While 62% of these events were caused by human errors or hacked accounts and not by people doing something wrong on purpose, their financial impact was enormous. Forty-one percent of respondents said their biggest insider incidents cost between $1 million and $10 million.

Data Breach Prevention Best Practices

Effective data breach prevention strategies require both current technology tools and knowledgeable human professionals. To employ a comprehensive approach, cybersecurity professionals need to fully understand their organization’s existing data and how best to protect it.

Know What Data the Organization Has

Organizations need a clear picture of what data they hold and where it lives. Three key steps in establishing this picture are:

• Classifying the data by its sensitivity level

• Flagging personally identifiable information and intellectual property

• Establishing handling policies for each category of data

These steps should be performed regularly as data is always growing and evolving.

Limit and Monitor Privileged Access

While employees need access to data to do their jobs well, access to sensitive information should follow the principle of least privilege. Access policies can vary for different organizations, but they commonly center on identity management principles and typically include the following:

• Rules that give employees and contractors access to the data and tools that are essential for them to do their jobs

• A description of the privileged access management (PAM) tools that will be used to help manage the process

• Requirements for regular reviews of who has access to what and why

Patch Vulnerabilities on a Regular Cycle

Structured, ongoing vulnerability management is central to effective data breach prevention. Scheduling for vulnerability patching may look different for every organization, as systems, data, and resources can vary, but scheduling programs often cover the following:

• Prioritizing patching systems that are most vulnerable to exploitation

• Tracking remediation throughout every step until it is completed

• Using simulated attacks, known as penetration testing, to uncover potential gaps and verify that existing defenses hold up to evolving threats

Encrypt Data at All Times

Whether an organization’s data is sitting in digital storage or actively being used, it should be encrypted to help ensure that, even if attackers gain access to it, they cannot read it. Encryption tools can be used across multiple layers of an organization’s technology stack, including the following:

• Network servers where data resides, including those on the premises and in cloud storage

• Endpoints where data moves across networks

• Desktops, laptops, and mobile devices

• Removable media, such as thumb drives and hard drives

Enhance Security of Networks and Endpoints

Network and endpoint security form the first line of defense against external threats. Typical ways that organizations enhance the security of their networks and endpoints include:

• Deploying firewalls and intrusion detection systems

• Using endpoint tools capable of detecting and responding to threats independently

• Verifying every access request rather than extending trust based on a network’s location

Train Employees Consistently

Technical controls work better when employees know how to respond appropriately to threats. Providing employees with regular security awareness training helps them understand their role in protecting their organization’s data. Employee training programs can include the following:

• Conducting phishing simulations to build recognition of common attack techniques

• Repeating training on a consistent schedule to keep employees’ security awareness current

Build and Test an Incident Response Plan

By creating a written incident response plan, cybersecurity leaders can help guide employees on how to act after a breach-related incident occurs so that the issue can be resolved safely and effectively. Key elements of incident response plans include:

• Defining roles and responsibilities before an incident occurs

• Defining escalation paths so the right people are notified and engaged at each stage

• Outlining containment, eradication, and recovery steps to guide teams throughout the process

Data Breach Prevention Resources

The following resources offer additional guidance on data breach prevention techniques, incident responses, and cybersecurity best practices for organizations looking to go deeper on any of the topics covered here.

• Federal Trade Commission, “Data Breach Response: A Guide for Business”: A framework that covers how to secure operations, assess what was taken, and notify affected parties

• CISA, Known Exploited Vulnerabilities Catalog: A regularly updated list of confirmed vulnerabilities that organizations can use as a benchmark for patching prioritization

• CISA, Cybersecurity Best Practices: Foundational guidance that can serve as a training and policy reference for organizations of all sizes

• IBM, “What Is a Zero-Day Exploit?”: A resource that describes what zero-day vulnerabilities are and how they’re weaponized before patches are available

• IBM, “Data Breach Prevention: 5 Ways Attack Surface Management Helps Mitigate the Risks of Costly Data Breaches”: A resource that describes how shadow information technology (IT) exposes high-value assets that security teams may not know exist

• TechTarget, “How to Prevent a Data Breach: 11 Best Practices and Tactics”: A data breach prevention guide applicable to various industries and organizations of all sizes

• Cymulate, “Unpatched Vulnerabilities Open Doors to Cybercrooks”: A resource that examines how organizations can close entry points via unpatched systems

• Fortinet, “What Is a Data Breach?”: An overview of various data breach types, causes, and prevention strategies

Careers in Data Breach Prevention

Cybersecurity professionals with skills in risk management, network security, vulnerability assessment, compliance, and incident response can pursue a career in data breach prevention.

Here are examples of different roles for professionals involved in data breach prevention:

Chief Information Security Officer

Chief information security officers (CISOs) are high-level executives who oversee an organization’s security strategy, manage its risk programs, ensure its compliance, and communicate its security priorities to senior leaders and across the organization. Payscale reports that the median annual salary for CISOs was $182,979 as of March 2026.

Director of Cybersecurity

Typical responsibilities for directors of cybersecurity include managing an organization’s security teams, overseeing its vulnerability assessments, and coordinating its incident response and compliance programs. As of March 2026, Payscale reports that the median annual salary for directors of cybersecurity was $189,273.

Cybersecurity Engineer

Cybersecurity engineers design and maintain systems that protect an organization’s infrastructure. This can include configuring firewalls, conducting security tests, and fixing vulnerabilities. The median annual salary for cybersecurity engineers was $107,399, as of March 2026, according to Payscale data.

Security Architect

Security architects create frameworks to protect an organization’s systems and data. Their work involves designing secure systems and ensuring new technologies meet the latest security standards. Payscale reports that the median annual salary for security architects was $149,773 as of January 2026.

Information Security Officer

Information security officers manage an organization’s security policies and ensure they are followed in all departments. Information security officers had a median annual salary of $102,173 as of November 2025, according to Payscale.

Penetration Tester

Penetration testers simulate cyber attacks in an organization’s systems to find vulnerabilities before real threats can exploit them. Penetration testers had a median annual salary of $103,271 as of March 2026, according to Payscale.

Staying Ahead in Cybersecurity

The World Economic Forum’s 2026 global cybersecurity outlook and Gartner’s top cybersecurity trends reports illustrate how AI is changing the game for both attackers and those charged with keeping systems secure. Geopolitics also makes the threat landscape more complex, according to the reports.

Preventing data breaches is a constant challenge. Cybersecurity professionals need to keep learning and adapting to the changes in technology and in attackers’ methods. The key for organizations is to create effective data breach prevention strategies that follow these fundamentals: Know what data the organization has and where it’s stored, establish security controls, keep systems patched, and be ready for the worst.