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Response snapshot Oct 27, 2026, 03:06 UTC

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Disclosed incidenthibp-operationendgame4

Operation Endgame 4.0 breach: 4,348,526 accounts exposed

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.

At a glance

Sources
1 source

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: Operation Endgame 4.0 (opens a new tab)

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.

Sources

  1. Primary source

    Have I Been Pwned: Operation Endgame 4.0 (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, July 26). Operation Endgame 4.0 breach: 4,348,526 accounts exposed. https://kevwire.com/record/hibp-operationendgame4

MLA

"Operation Endgame 4.0 breach: 4,348,526 accounts exposed." KEVWire, 26 July 2026, kevwire.com/record/hibp-operationendgame4.

Chicago

KEVWire. "Operation Endgame 4.0 breach: 4,348,526 accounts exposed." Last modified July 26, 2026. https://kevwire.com/record/hibp-operationendgame4.

Evidence summary (plain text)

Operation Endgame 4.0 breach: 4,348,526 accounts exposed (Jun 18, 2026).
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.
Sources:
Have I Been Pwned: Operation Endgame 4.0: https://haveibeenpwned.com/Breach/OperationEndgame4
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-operationendgame4.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 02:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2026-06-18; loaded 2026-06-18. Exposed data: Email addresses, Passwords. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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