What is a data breach?
A data breach happens when unauthorized people gain access to a company's confidential information: customer data, passwords, financial records or internal documents. It can be the result of a deliberate attack, such as a credential theft or a ransomware, or of an accidental exposure, such as a file left open by mistake. Either way, the damage is the same: information that should be confidential ends up in the hands of those who should not have it.
How a data breach happens
A breach is rarely a single, instant event: it is usually the end of a chain that started much earlier. The most common path has four stages.
Initial access
The attacker gets in through the easiest door: a stolen credential bought on the dark web, a phishing email or an unpatched software flaw.
Movement and escalation
Once inside, they move across the network looking for more access and for where the valuable information is stored, often unnoticed for weeks.
Exfiltration
The data is copied out of the company, quietly. This is the moment the confidential information actually leaves your control.
Exposure or use
The data is sold, used in fraud, published to pressure the victim (as in double extortion) or made public, triggering loss, fines and broken trust.
Source: N-able Cyber Encyclopedia and IBM (Cost of a Data Breach).
The main causes of a data breach
- Stolen or weak credentials, today the leading entry vector, often bought on the dark web
- Phishing and social engineering, which fool an employee and open the door from the inside
- Malware and ransomware, which steal the data before encrypting it
- Unpatched software flaws, exploited before the fix is applied
- Cloud misconfiguration, such as a file store left public by mistake
- Insider action, whether by malice or by unintentional error
- A supplier compromise, which becomes the door into your company's data
Intentional breach and accidental leakage
- Intentional breach (data breach) An external attacker breaks in on purpose to steal information, using stolen credentials, phishing or malware. It is the active attack, with someone deliberately trying to get in.
- Accidental leakage (data leakage) The unintentional exposure of confidential data through negligence or error: a misconfiguration, a file sent to the wrong person, a store left open. There is no attacker, but the data is exposed all the same and becomes a door into a breach.
- Insider threat Someone with legitimate access, an employee or supplier, exposes the data, by malice or by carelessness. Because the access is authorized, it tends to be the hardest to detect.
Why a data breach is so expensive for your company
A data breach is one of the most expensive incidents a company can suffer, and the cost goes far beyond technology. The global average cost of a breach reached $4.44 million in 2025, and companies took, on average, 241 days to identify and contain the incident, more than enough time for the damage to spread. The bill adds up investigation, halted operations, customer notification, lawsuits and, increasingly, fines: more than 140 countries now have data protection laws, and rules like the LGPD in Brazil and the GDPR in Europe carry penalties reaching a percentage of the company's global revenue. Harder to recover is trust: customers who learn their data was exposed take time to return, and some do not. That is why a breach is a business risk, not just an IT one, and defense has to cover the whole chain, from prevention to early detection.
How to reduce the risk of a data breach
No single measure eliminates the risk, but the right combination reduces the chance of the breach and the time to detect it. In the order that protects most:
- Protect access: MFA and least privilegeSince the credential is the #1 vector, requiring a second identity check and giving each person only the access they need closes the most-used door.
- Endpoint detection and response (EDR)A defense that watches behavior recognizes the attacker's movement and the exfiltration attempt before the data leaves.
- Dark web monitoringFinding out that a company credential is for sale lets you rotate it before it is used, reducing the exposure time.
- Secure updates and configurationClosing known flaws and reviewing cloud configurations eliminates two of the most common causes, the unpatched flaw and the store left open.
- Encryption and isolated backupEncrypted data loses its value if copied, and a backup separated from the network ensures recovery without depending on the attacker.
- Incident response planA rehearsed plan shortens the average 241 days of detection and containment, which directly reduces the cost and the reach of the breach.
In practice
The question that reveals the real risk: if one of your company's credentials were for sale on the dark web right now, would anyone find out in time to rotate it, or would the first warning be the breach itself already in progress?
How Zamak protects your company's data
Zamak Technologies protects against breaches by covering the whole chain, not just one point. The defense combines access protection with a second identity check, endpoint detection and response, isolated and immutable backup and dark web monitoring, which warns when a company credential appears for sale, all followed by a security operations center that shortens the time between the incident and the response. That way, the breach is attacked in prevention and in early detection, where the cost is still low. A good starting point is threat intelligence, which monitors your company's exposure beyond the perimeter.