Nullivo

Data breaches → Operation Endgame 4.0

Was your data in the Operation Endgame 4.0 breach?

2026 · ~4,348,526 accounts exposedCritical severity · 9/10

Operation Endgame 4.0 suffered a data breach in 2026 that exposed around 4,348,526 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

On 18 June 2026, the latest phase of Operation Endgame targeted the SocGholish malware operation, a prolific malware distribution network used to compromise systems and facilitate further cybercrime. Coordinated by international law enforcement agencies with support from Europol and Eurojust, the operation remediated almost 15,000 compromised websites and disrupted more than 100 servers and domains used to distribute malware. Authorities initially provided HIBP with 154k impacted email addresses and more than half a million previously unseen passwords. The following week, a further 4M email addresses and 9M passwords relating to the StealC malware operation also targeted by Operation Endgame were provided, followed by another 131k email addresses the following month, bringing the total to more than 4.3M unique email addresses.

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 Operation Endgame 4.0 breach exposed and what each item actually enables:

Passwords

Attackers replay leaked passwords across other sites (“credential stuffing”). Because most people reuse passwords, one leak often unlocks email, shopping and banking accounts elsewhere.

Email addresses

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.

  1. Passwords: Change this password everywhere you have reused it, starting with your email account — whoever controls your email can reset everything else.
  2. Email addresses: Treat any message referencing this service with suspicion, and never act on links in unexpected emails.
  3. 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 recent, so the data is actively traded and the risk is at its highest right now.

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.

Check if your email was exposed.Nullivo's free scan checks your own verified email against known breaches — including Operation Endgame 4.0 — in 30 seconds. No password, no signup, and we only ever scan your own email. Run your free scan →

Frequently asked questions

What data was exposed in the Operation Endgame 4.0 breach?

The Operation Endgame 4.0 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 Operation Endgame 4.0 breach?

Around 4,348,526 accounts were exposed, making it a large breach.

What should I do if I had a Operation Endgame 4.0 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 Operation Endgame 4.0 breach affected you, these breaches exposed comparable information — worth checking too, since leaked datasets are routinely combined.

See all breaches we cover →