Hackers have posted personal data from hundreds of German politicians from major parties, including credit card details and mobile phone numbers, ARD TV said on Friday.
The data, published on a Twitter account, also included addresses, personal letters and copies of identity cards, the public broadcaster said, citing affiliate rbb.
All major German parties except for the far-right AfD are affected. The identity of the hackers and their motive were not known, the report said.
Reuters was not immediately able to confirm the report.