MyRecon OSINTSynthient Stealer Log Threat Data
Behind the exposed accounts
During 2025, Synthient aggregated billions of records of "threat data" from various internet sources .
Follow the story
On 11 April 2025, Synthient Stealer Log Threat Data was breached. 182,962,095 accounts were exposed, including email addresses, passwords. MyRecon rates it 83/100, critical. That is roughly everyone in Russia.
How the story unfolded
Open a step to read the detail. Missing dates stay unknown.
02Entry point
The records came from information-stealing malware on people's devices, rather than a single company database.
03Discovery and disclosure
A separate discovery or company-disclosure date is not established by this feed record.
04Added to the breach catalogue
2025-10-21. This is the catalogue date, not necessarily the disclosure date.
05Reported outcome
182,962,095 accounts are listed in this breach. This is a count of accounts, not necessarily individual people. The reported exposed data includes Email addresses, Passwords.
183 million unique addresses, harvested by malware from individual people's own machines, gathered into one set in the course of a single year. The volume is the finding. Endpoint infection is not a rare misfortune that befalls careless people, at this scale it is a background condition of using a computer.
What separates this from a leaked database is where the data was standing when it was taken. A breach exposes what a company stored about you. A stealer log exposes what you typed, into services that were never breached, including ones whose security is genuinely good, along with whatever the browser had saved on your behalf. The browser's password store is usually the first thing collected, because it is one file and anything running as you can decrypt it.
So the response starts with the machine and not the accounts. Cracked software and convincing installers for legitimate tools are how most of these infections arrive, which is why the population in these files skews towards people who thought they were being resourceful rather than reckless. If an address of yours turns up in a set like this, treat everything entered on that device as known, clean or rebuild it first, and only then rotate credentials, beginning with the mailbox that can reset all the others.
The story behind the breach
During 2025, Synthient aggregated billions of records of "threat data" from various internet sources . The data contained 183M unique email addresses alongside the websites they were entered into and the passwords used. After normalising and deduplicating the data, 183 million unique email addresses remained, each linked to the website where the credentials were captured, and the password used.
This dataset is now searchable in HIBP by email address, password, domain, and the site on which the credentials were entered.
Breach description from Have I Been Pwned, used under a CC BY 4.0 licence.
How did it happen?
The records came from information-stealing malware on people's devices, rather than a single company database.
What was the motive?
The published account does not establish the motive. We cannot tell what the attackers intended from the exposed data alone.
Reported demands or attempts to sell data describe what happened, rather than prove every attacker's intention.
What was the outcome?
182,962,095 accounts are listed in this breach. This is a count of accounts, not necessarily individual people.
The reported exposed data includes Email addresses, Passwords.
What was exposed, and why it matters
Email addresses
The address becomes a confirmed, active target, expect more phishing, better aimed.
Passwords
Anyone reusing this password elsewhere has those accounts exposed too, credential stuffing is automated and tries them all within days.
What to do if you were in it
Questions people ask about this breach
Was my email address in the Synthient Stealer Log Threat Data breach?
Use the email box on this page. The result applies only to this incident. If the provider does not cover this breach, we say so. A missing match does not prove you were unaffected.
What data was leaked in the Synthient Stealer Log Threat Data breach?
email addresses, passwords. Each one is explained above, along with what it means for the person it belongs to.
When did it happen, and when did it become public?
The breach is dated 11 April 2025. It was published to Have I Been Pwned on 21 October 2025, a gap of 194 days during which the data was already out.
Is the Synthient Stealer Log Threat Data breach real?
Yes. Have I Been Pwned lists it as verified, meaning the data was checked against the source rather than taken on trust.
How many people were affected?
182,962,095 accounts. That is roughly everyone in Russia. That is accounts rather than people, one person often has several.
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Three kinds of content appear on this page and they are kept apart deliberately. The breach description is quoted from Have I Been Pwned under its licence. The severity score, the field-by-field explanation and the advice are computed from the record itself, every sentence derives from a number or a flag in it, which is what stops the analysis drifting from the evidence. Anything under the "MyRecon's take" byline is editorial: our reading of this breach, presented as opinion rather than as a finding.