Data Breach Roundup (Apr 3 - 9, 2026)

Die Linke German political party confirms data stolen by Qilin ransomware

Die Linke is a "German democratic socialist political party." Bleeping Computer says they have 123,00 registered members and 64 members in German Parliament. They haven't revealed a lot of details about this breach, but the party claims that the membership database was not accessed while the attackers claim they stole information on employees at the party HQ.

Die Linke German political party confirms data stolen by Qilin ransomware

The Qilin ransomware group has claimed responsibility for an attack against Die Linke (‘The Left’), forcing an IT systems outage at the political party, and threatening sensitive data leak.

BleepingComputerBill Toulas

Mercor, a $10 billion AI startup that works with companies including OpenAI and Anthropic, confirms major data breach

Mercor is a startup that provides training data to AI companies. This (unconfirmed) incident, alleged to be part of the recent LiteLLM supply chain attack, claims that some data sets used by Mercor have been leaked. A sample of the data shows Slack data, internal tickets, and two videos between Mercor's AI and contractors using the platform. The attackers claim to possess source code and database records.

Mercor, a $10 billion AI startup, confirms it was caught up in a major security incident | Fortune

The high-flying startup that provides AI training data to OpenAI, Anthropic, and Meta confirms it was hit by a “supply-chain attack.”

FortuneBeatrice Nolan

Hackers steal and leak sensitive LAPD police documents

This breach includes 337,000 files totaling 7.7 TB. The stolen data included police officer personnel files, internal affairs investigations, and discovery documents that can include unredacted criminal complaints and personal information, such as witness names and medical data. The data was originally published by World Leaks but taken down for unknown reasons. Distributed Denial of Secrets said that they were able to review it before it was taken down.

Hackers steal and leak sensitive LAPD police documents | TechCrunch

The LAPD said the breach affected “a digital storage system” belonging to the city’s Attorney’s Office. The World Leaks extortion gang was reported to be behind the attack.

TechCrunchLorenzo Franceschi-Bicchierai