10 Data Breaches to Know About (April 2026)

"Mercor, the AI startup working with notable organizations such as Meta, Anthropic, and OpenAI, reportedly lost four terabytes of data in a breach. A LiteLLM supply-chain incident led to this breach. Security experts say this incident highlights how connecting data to AI models via proxies (such as LiteLLM) creates sensitive blind spots."

"An FBI surveillance system was breached, potentially exposing FBI criminal probes and targets of FBI surveillance. Early investigations suspected Chinese government-affiliated hackers, and cybersecurity experts point out this event and the Salt Typhoon telecommunications hack in 2024."

"A state-run Chinese supercomputer allegedly had 10 petabytes of data stolen from it. The compromised information is sensitive in nature, and may include classified defense documents, missile schematics and more."

"The Los Angeles Police Department (LAPD) had sensitive records exposed after a breach of the L.A. City Attorney's Office. Seven terabytes of data were exposed, including sensitive information such as witness name and unredacted criminal complaints."

April 2026 included notable data breaches across government agencies, AI startups, and major organizations. An AI startup working with major technology firms reportedly lost four terabytes of data through a LiteLLM supply-chain incident, raising concerns about blind spots created when data is connected to AI models via proxies. An FBI surveillance system was breached, potentially exposing criminal probes and surveillance targets. A state-run Chinese supercomputer was allegedly compromised, with 10 petabytes of sensitive data stolen, potentially including classified defense materials and missile schematics. The Los Angeles Police Department had seven terabytes of sensitive records exposed after a breach involving the L.A. City Attorney’s Office. A Salesforce database misconfiguration reportedly led to a McGraw Hill breach attributed to a known threat actor group.

Read at Securitymagazine