Chinese companies have leaked a whopping 590 million resumes in the first three months of the year, ZDNet has learned from multiple security researchers.

Most of the resume leaks have occurred because of poorly secured MongoDB databases and ElasticSearch servers that have been left exposed online without a password, or have ended up online following unexpected firewall errors.

Over the past few months, and especially over the last few weeks, ZDNet has received several tips about exposed servers that --when investigated-- belonged to Chinese HR-focused companies.

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