The National Cyber Security Centre team (NCSC) and Hold Security have setup a cooperation which allowed the NCSC to get hold of 1,3 million vulnerable Dutch e-mail addresses and 5600 vulnerable Dutch websites.
Hold Security had announced that they had gained a massive dataset of 1.2 billion credentials via vulnerable websites worldwide.
The NCSC explains that the information which they have collected holds;
The National Cyber Security Centre has informed their partners, which will inform the identities which are identified in the dataset.
You can read the official Dutch press release here