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A data breach happens when someone unauthorized accesses, steals or discloses information that compromises one or more elements of the CIA triad: confidentiality (keeping data private), integrity (ensuring correctness) and availability (maintaining access for legitimate users). Depending on the industry and country, laws can mandate how quickly businesses must report breaches. Breaches also bring business interruption, operational problems and potential damage to a brand.

Breaches can be caused by many things, including phishing, stolen credentials, software flaws, and malware. Employees can expose sensitive data by emailing it to the wrong people or enabling overly permissive sharing links in collaboration tools. Cloud misconfigurations can make files available to anyone, and physical breaches happen when laptops or USB drives containing important information are lost.

Once attackers gain initial access, they can use lateral movement techniques to navigate a network and discover valuable information. They may then exfiltrate the information in small increments to avoid detection or encrypt it using ransomware. The data can then be sold or used for extortion.

Work with forensics experts to analyze backup or preserved information and determine whether encryption was enabled. Find out who had access to the affected data at the time of the breach, and check whether your segmentation plan was effective. Consider reassessing your relationship with service providers, as they can be a source of data breaches. Make sure they’re not sharing data with other companies and have updated their security questionnaires. Finally, have a communications plan for consumers and be ready to answer their questions in plain language.