Data breaches → Yandex Dump
Was your data in the Yandex Dump breach?
2014 · forum.btcsec.com · ~1,186,564 accounts exposedCritical severity · 9/10
Yandex Dump (forum.btcsec.com) suffered a data breach in 2014 that exposed around 1,186,564 accounts. If you had an account, some of your personal data may be circulating in leaked databases. The fastest way to know is to check your own email — free, in about 30 seconds, no password required.
What happened
In September 2014, news broke of a massive leak of accounts from Yandex, the Russian search engine giants who also provides email services. The purported million "breached" accounts were disclosed at the same time as nearly 5M mail.ru accounts with both companies claiming the credentials were acquired via phishing scams rather than being obtained as a result of direct attacks against their services.
Breach details sourced from Have I Been Pwned, the industry-standard breach database. Risk analysis by Nullivo.
What was exposed, and why it matters
Not all breaches carry the same risk — what matters is which fields leaked. Here is what the Yandex Dump breach exposed and what each item actually enables:
Attackers replay leaked passwords across other sites (“credential stuffing”). Because most people reuse passwords, one leak often unlocks email, shopping and banking accounts elsewhere.
Puts you on spam and phishing lists, and confirms to attackers that you hold an account with this service — which makes impersonation emails more believable.
What to do if you were affected
These steps are ordered for this specific breach — the most urgent action given what leaked comes first.
- Passwords: Change this password everywhere you have reused it, starting with your email account — whoever controls your email can reset everything else.
- Email addresses: Treat any message referencing this service with suspicion, and never act on links in unexpected emails.
- Check whether your own email appears in this breach — run a free scan to confirm before you spend time on the steps above.
How urgent is this now?
This breach is over 12 years old. Old credentials still cause harm — leaked passwords from a decade ago are still tried against new accounts every day.
Passwords are the reason breach age matters less than people expect. Leaked credentials are compiled into wordlists that get tried against new services for years afterwards, so a password exposed here is unsafe to use anywhere, ever again.
Remember: a breach can't be "un-leaked" — once a database is out, it exists in countless copies. The goal is to make the leaked data useless: change what can be changed, lock down what can't, and remove what has been republished.
Frequently asked questions
What data was exposed in the Yandex Dump breach?
The Yandex Dump breach exposed passwords, email addresses. Attackers replay leaked passwords across other sites (“credential stuffing”). Because most people reuse passwords, one leak often unlocks email, shopping and banking accounts elsewhere.
How many people were affected by the Yandex Dump breach?
Around 1,186,564 accounts were exposed, making it a large breach.
What should I do if I had a Yandex Dump account?
Change this password everywhere you have reused it, starting with your email account — whoever controls your email can reset everything else. You can check whether your own email appears in this breach with a free Nullivo scan — no password required.
Breaches that exposed similar data
If the Yandex Dump breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.
- Was your data in the NextGenUpdate breach? (2014, ~1,194,597 accounts)
- Was your data in the Bin Weevils breach? (2014, ~1,287,073 accounts)
- Was your data in the Forbes breach? (2014, ~1,057,819 accounts)
- Was your data in the diet.com breach? (2014, ~1,383,759 accounts)
- Was your data in the Manga Traders breach? (2014, ~855,249 accounts)
- Was your data in the Black Hat World breach? (2014, ~777,387 accounts)