561,108 UK Logins Leaked Just Weeks Ago, Act Fast

Over Half a Million UK-Targeted Logins Surface on Telegram

HEROIC analysts found a large file titled "UNITED_KINGDOM" uploaded to Telegram on June 17, 2026. The list contains 561,108 records pairing email addresses with plaintext passwords and the URLs those logins were used on, grouped together as UK-focused accounts.

Why This Is Dangerous

At more than half a million records, this is one of the larger lists HEROIC analysts have tracked recently, and it appeared on Telegram only a matter of weeks ago. Because the passwords are stored in plaintext and matched to specific login URLs, the accounts inside are immediately usable, with no time-consuming cracking required.

What Was Exposed

• Email addresses
• Plaintext passwords
• Associated login URLs

Why This Matters

A list of this size is large enough to power automated credential stuffing campaigns that test each login against dozens of other websites within minutes. The longer this data circulates, the more likely reused passwords are found and exploited, leading to account takeover on email, banking, or shopping accounts far removed from the original leak.

How Large Regional Combo Lists Come Together

Lists sorted by country, like this one, are typically assembled from information-stealing malware logs collected across many infected devices, then filtered by region to appeal to buyers running localized attacks. A file of over 561,000 records suggests either a large-scale infection campaign or the merging of several smaller batches over time.

Check If You Are Affected

Given how recently this list appeared and its size, checking your exposure now matters more than usual. HEROIC's free breach scanner searches more than 400 billion leaked records, including large regional combo lists like this one, so you can find out quickly and act before your credentials are misused.