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Confirmed breach

Cierant data breach

USUnited States · Cierant Corporation

Cierant (United States) notified the California Attorney General and the Washington Attorney General of a data breach on 7 July 2025. It told the states about 902 Washington residents; the total can be higher. The breach began on 9 December 2024, 210 days before it was reported.

Status
Confirmed breach
People affected
902 Washington residents (one state’s count; the total can be higher)
Reported
7 July 2025
Breach began
9 December 2024
Time to tell
210 days (the median in California’s notices over the last year: 154 days)

What was exposed

The register’s list does not say what was exposed; the notice it links to (under Sources) usually does.

Before the notice: the ransomware gang Cl0p named Cierant on its leak site on 1 February 2025, 156 days before this was reported. Matched by the organisation’s name: the notice itself does not say who the attacker was.

What changed since it was first reported

  1. Confirmed breach, 902 Washington residents (Washington Attorney General)

Sources

Official notices are read by code from the regulator’s own register. More notices to California, Washington. · Corrections and changes

If Cierant had your data

  1. Look for Cierant Corporation’s own notice or letter: it should say what of yours was involved. Keep it.
  2. The register’s list does not say what was exposed; the notice it links to (under Sources) usually does. If Cierant Corporation has a password of yours, change it now to be safe.
  3. Expect scams that use your details: calls, texts or emails pretending to be Cierant Corporation, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

One email to confirm first. We use your address only for this alert, and one click deletes it.

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From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.