Summary Welcome to another monthly round-up of monthly cyber attack and data breach news. In June 2025, IT Governance found 33 publicly disclosed cyber security incidents, including the leak of 16 billion user credentials compiled from years of infostealer malware and previous breaches. Although this was, strictly speaking, not a new data breach, we include it in this month’s round-up as it featured in the news in June and still requires individuals and organisations to take action to secure their accounts. Excluding this mass credential dump, more than 23 million records were compromised in newly revealed attacks, reflecting the persistent

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