Breach occurred 2025-04-11VerifiedStealer-log sourced

Synthient Stealer Log Threat Data data breach

What happened

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.

182,962,095 accounts affected

Breach date 2025-04-11

Data exposed

Email addressesPasswords

Frequently asked questions

When did the Synthient Stealer Log Threat Data data breach happen?

The Synthient Stealer Log Threat Data data breach occurred on April 11, 2025. It was added to Have I Been Pwned's breach catalog on October 21, 2025.

How many accounts were affected by the Synthient Stealer Log Threat Data breach?

182,962,095 accounts were affected by the Synthient Stealer Log Threat Data data breach, according to Have I Been Pwned's records.

What data was exposed in the Synthient Stealer Log Threat Data breach?

The Synthient Stealer Log Threat Data breach exposed the following data types: Email addresses, Passwords.

Is the Synthient Stealer Log Threat Data breach verified?

Yes. Have I Been Pwned has verified the Synthient Stealer Log Threat Data breach, meaning there's confirmed evidence the exposed data is genuine and tied to real accounts.

Was the Synthient Stealer Log Threat Data breach sourced from a stealer log?

Yes. The Synthient Stealer Log Threat Data entry is sourced from an information-stealing malware log rather than a direct company breach disclosure — the credentials were harvested from infected devices, not taken from Synthient Stealer Log Threat Data's own systems.

How do I check if my email was affected by the Synthient Stealer Log Threat Data breach?

Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the Synthient Stealer Log Threat Data breach, or any other known breach — the tool never stores what you search.

Was your own email in this breach?

Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach — or any other known breach — without ever storing what you search.

Check your email →

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