Data breach: understand the causes, impacts, and how to avoid.

In an increasingly digital world, data breaches have become one of the greatest threats to the reputation, customer trust, and viability of companies. In the third quarter of 2024 alone, over 422 million records were leaked globally — a clear indication that no organization is immune.

The financial impact of these incidents is equally significant: it is estimated that in 2024, the average cost of a data breach reached US$ 4.88 million per incident. In Brazil, in addition to direct costs, the consequences include damage to image and loss of trust, which can quickly lead to revenue decline and customer disengagement.

The General Data Protection Law (LGPD) also reinforces the need for prevention by imposing fines of up to 2% of the company’s revenue, limited to R$ 50 million, as well as the obligation to notify data subjects and authorities in the event of a breach. 

In this article, we will explore what a data breach is, what the most common types are, how to identify it, who is more vulnerable, the limits between a security incident and a data breach, what Brazilian legislation says about it, and how organizational culture can help prevent these failures. If you want to understand how to protect your company from this risk — and turn data security into a competitive advantage — keep reading.

What is a data breach?

The term data breach refers to a data violation, that is, when sensitive information of a company, its customers, or employees is accessed, copied, transmitted, stolen, or exposed without authorization. Unlike isolated technical failures, a data breach represents a breach of confidentiality and data security, which can involve anything from personal information, such as social security numbers and addresses, to strategic business data.

This type of occurrence can happen in various ways: through intentional cyber attacks, system protection failures, employee carelessness, or even configuration errors in servers and databases. In any scenario, the result is the same: the information ceases to be restricted and starts to circulate improperly, creating opportunities for fraud, financial losses, and reputational damage.

In summary, a data breach is not just a technological problem but a business risk that directly impacts customer and partner trust and can lead to serious legal consequences.

2. What are the most common types of data breaches?

A data breach can occur in different ways, varying according to the vulnerability exploited or the failure that allowed unauthorized access. Knowing the most common types helps companies better understand where their points of attention are and how to structure prevention plans.

External attacks (hacking)

These occur when criminals exploit flaws in systems, networks, or applications to steal data. This includes invasions through malware, phishing, or the exploitation of known vulnerabilities.

Internal threats

Many breaches do not come from outside but from within the organization itself. Malicious or even careless employees can copy, share, or expose sensitive data.

Loss or theft of devices

Laptops, phones, and external hard drives that store confidential information can be lost or stolen, opening pathways for unauthorized access.

Configuration errors

Cloud servers or poorly configured databases often leave data exposed on the internet without the need for authentication, allowing public access to critical information.

Accidental leak

This occurs when data is sent to the wrong recipients, published in inappropriate places, or exposed due to a lack of adequate controls.

Each of these scenarios represents real risks, but they all share something in common: they can be prevented with clear security policies, continuous monitoring, and an organizational culture focused on information protection.

What signs indicate that a company has suffered a data breach?

Quickly identifying a data breach is essential to reduce damage and respond appropriately to clients, partners, and regulatory authorities. The problem is that, in many cases, the signs can be subtle and easily confused with common operational failures.

One of the most frequent indicators is the presence of unusual activities in systems and networks, such as access outside of normal hours, repeated login attempts, or transfers of data in volumes larger than usual. There may also be unexpected changes in files and configurations, indicating that someone external or internal tampered with information without authorization.

Another warning sign is an increase in phishing incidents or customer complaints reporting suspicious messages, which may mean that contact data has been compromised. In some cases, the very slowness or instability of systems may be linked to unauthorized data extraction in the background.

Lastly, companies often discover a data breach when they receive external notifications, whether from business partners, regulatory bodies, or even the specialized press. These alerts reinforce the importance of continuously monitoring internal environments to avoid depending on third parties to identify the breach.

Recognizing these signs and treating them seriously is the first step to responding effectively and minimizing the impacts of a data breach.

Which sectors are most vulnerable to a data breach and why?

Although no organization is completely immune to a data breach, some sectors are more targeted due to the volume and sensitivity of the data they store.

Financial sector

It deals daily with banking information, transactions, and personal data of high value in the illegal market, making it one of the main targets for attacks.

Healthcare sector

Medical records and clinical histories are extremely sensitive and long-lasting data that, once exposed, can cause serious and irreversible consequences.

Retail and e-commerce

They process large volumes of digital transactions and store payment data from millions of consumers, increasing fraud risks and reputational impact.

Public sector

It holds information about citizens in massive databases, often backed by outdated technological infrastructure, which increases vulnerability to security failures.

In summary, sectors dealing with financial, health, or personal identification data on a large scale are naturally more exposed to data breaches. Therefore, they need to adopt robust protection strategies, continuous monitoring, and a security culture that involves the entire organization.

What differentiates a security incident from a data breach?

The terms “security incident” and “data breach” are often used synonymously, but there is an important distinction between them. Every data breach is a security incident, but not every security incident can be classified as a data breach.

A security incident occurs when there is any failure, vulnerability, or event that threatens the integrity, confidentiality, or availability of a company’s information. This can include foiled intrusion attempts, temporary unavailability of systems, or even hardware failures that impact access to data.

A data breach, on the other hand, happens when a violation is successful and the data is indeed exposed, accessed, or extracted without authorization. It is the confirmation that the security barrier has been breached and that sensitive information is no longer protected.

This distinction is important because it directly influences legal obligations and the organization’s response. While an incident may require internal security adjustments, a data breach necessitates notifications to regulatory authorities, communication with affected customers, and immediate measures to contain and mitigate the impact.

What does Brazilian legislation (such as the LGPD) say about data breaches?

In Brazil, the General Data Protection Law (LGPD) is the main regulation governing how companies should handle data breach situations. It establishes that whenever there is a data breach that may pose a risk or significant harm to the information subjects, the company is obliged to notify both the National Data Protection Authority (ANPD) and the affected data subjects.

This notification must be made within a reasonable timeframe and must include details such as: the nature of the compromised data, the associated risks, the security measures adopted before the incident, and the corrective actions taken after the breach. The objective is to ensure transparency and provide citizens with the means to protect against possible misuse of their information.

Furthermore, as mentioned at the beginning of this text, the LGPD imposes severe administrative penalties for non-compliance, which can include warnings, blocking or deletion of personal data related to the incident and, in more severe cases, fines of up to 2% of the company’s revenue, limited to R$ 50 million per violation.

In practice, Brazilian legislation makes it clear that a data breach is not just a technical problem, but also a regulatory and public trust issue. Companies that do not treat this matter seriously risk not only financial losses but also irreparable damage to their reputation.

How can organizational culture help prevent data breaches?

Advanced technologies are fundamental to reducing risks, but preventing data breaches does not rely solely on tools: it starts with the organizational culture. When employees understand the importance of data protection and incorporate good practices into their daily routines, the company strengthens its defense line against breaches.

This involves awareness and continuous training, helping teams recognize phishing attempts, follow access protocols, and identify suspicious behaviors. Additionally, a security culture encourages shared responsibility, where every area — not just the IT team — plays an active role in protecting information.

Another key point is data governance: when policies, processes, and responsibilities are clear, the company manages to align regulatory compliance, privacy protection, and operational efficiency. This way, security ceases to be seen as an obstacle and is perceived as an integral part of the business strategy.

It is precisely in this alignment between technology and people that Objective can support your organization. With expertise in information security, data governance, intelligent automation, and digital culture, we help companies structure robust policies, implement monitoring solutions, and engage teams in safe practices that drastically reduce the risk of incidents.

If your company wants to strengthen its security culture and protect itself against data breaches, talk to the experts at Objective and find out how to turn prevention into a competitive advantage.