Data Breach Index (A–Z) – U

Explore 54 data breaches in the U group. Open a record for exposed data classes, affected account counts and recommended security steps.

U

U.S. Department of Homeland Security (DHS) Data BreachU.S. DOJ and DHS 2016 Data BreachUalabee Data BreachUber Data BreachUbisoft.com Forum Alleged Data ExposureUbook Data BreachUCAR Data BreachUdemy 2026 Data BreachUFC Fight Club Forums Alleged Data ExposureUI Community HomeCare and UI Health Care 2025 Data BreachUiggy Data BreachUK Department for Education 2026 Data BreachUK Electoral Commission Data BreachUK Government Investments 2025–2026 Data BreachUKScrappers Alleged Data ExposureUlmon Data BreachUltrahuman 2026 Data BreachUMass Amherst Data BreachUnder Armour 2025 Data BreachUnderworld Empire Data BreachUnico Campania Data BreachUnigame Data BreachUnigen Yapı Data BreachUnion Home Mortgage Data BreachUnited Medical Doctors 2025 Data BreachUnited States Multi-State Voter Registration Records Compilation Data BreachUniversarium Data BreachUniversity of California Data BreachUniversity of Copenhagen (Københavns Universitet) Data BreachUniversity of Dallas Data BreachUniversity of Hawaiʻi Cancer Center 2025 Data BreachUniversity of Nebraska Medical Center Data BreachUniversity of Nottingham 2026 Data BreachUniversity of Pennsylvania 2025 Data BreachUniversity of Phoenix Data BreachUniversity of St. Thomas-Houston Data BreachUniversity of Sydney Code Library 2025 Data BreachUniversity of the People (UoPeople) 2025 Data BreachUnix.com Forums Alleged Data ExposureUnlimited Technology Systems 2025 Data BreachUnreal Engine Data BreachUNSS (2026) Data BreachUpbound Group 2026 Data BreachUPPCL India Power Corporation 1.35M Consumer Data BreachUpstox Data BreachURentBike 2022 Data BreachUS EPA Alleged Data Leak (2024) – Email CheckUSA Criminal & Arrest Records 70M Data Leak Data BreachUSA.Life Alleged Data ExposureUSTA Texas Data BreachUtah Gun Exchange Data BreachUtair 2019 Data BreachuTorrent Data Breachuuu9 Alleged Data Exposure