The Fastmail.co.uk Log Contains 1,602 Stolen Email and Password Pairs

HEROIC analysts identified this stealer log on 10-Jun-2026. The breach exposed 1,602 records, with stolen data including email addresses, plaintext passwords, and URLs. The source is identified as fastmail.co.uk, the UK domain of Fastmail, a privacy-focused email service provider.

Why This Is Dangerous

Email service credentials are uniquely dangerous because the inbox is the master key to everything else. With access to an email account, an attacker can trigger password resets on banking, shopping, healthcare, and any other service linked to that address. This stealer log exposes plaintext passwords alongside the exact URLs where they were used, so attackers already know which accounts to target first.

What Was Exposed

• Email Addresses
• Plaintext Passwords
• URLs (the specific websites where credentials were active)

Why This Matters

Anyone whose Fastmail credentials appear in this log faces the risk of having their entire digital life accessible to a criminal. A compromised email account enables account takeover of any service that sends password reset links to that address. Financial fraud, identity theft, and unauthorized access to private communications are all realistic consequences of this type of breach.

How Stealer Logs Work

Stealer malware targets the credentials stored in a browser after a user saves their login. When a user visits a site and saves their password for convenience, the malware silently reads that stored data and sends it to the attacker along with the web address it belongs to. The attacker then packages everything into a log file and shares it through encrypted Telegram channels for other criminals to use.

Check If You Are Affected

HEROIC offers a free breach scanner that searches 400 billion records. Search your email address now to see if your credentials appear here or elsewhere. Free, takes seconds.