This year, the CDU (center-right christian party) filed charges against Lilith Wittmann, who notified the CDU about a data leak concerning their election campaign app, which exposed personal data of 500,000 people. Data such as city of residence, street, age, gender and political opinions. [1]
[1] https://www.berliner-zeitung.de/en/the-cdus-leaky-campaign-a...