Cybersecurity
Data Breach
An incident where confidential data — usernames, passwords, card numbers, IDs — is copied or exfiltrated from an organization by an unauthorized party.
Updated · GACS — Global Anti-Crime & Safety
Cite this definition as gacs.app/glossary/data-breach.
Learn more on GACS
Source: GACS — Global Anti-Crime & Safety · Published by the GACS Research Team · Updated October 21, 2026
Cite this page: GACS (2026). Data Breach — GACS Glossary. https://gacs.app/glossary/data-breach · Record ID GACS-glossary-data-breach
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Authoritative sources
Independent primary sources used to check and corroborate the guidance on this page.
US IdentityTheft.gov (FTC)Official recovery plans for identity theft victims.
CISA — Phishing GuidanceUS cyber agency guidance on phishing and credential theft.
UK National Cyber Security CentreNCSC advice on suspicious emails, texts and account takeover.