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Confirmed breach

Stanislaus County Health Services Agency data breach

USUnited States

Stanislaus County Health Services Agency (United States) notified the California Attorney General of a data breach on 31 July 2026. The breach began on 2 December 2025, 241 days before it was reported.

One of 12 organisations whose data was taken through Aesto. The Aesto breach →

Status
Confirmed breach
People affected
Not reported yet
Reported
31 July 2026
Breach began
2 December 2025
Found to notice
66 days (found 26 May 2026, by the company’s letter)
Time to tell
241 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.

How it happened

How
Hacking On or about December 18, 2025, Aesto experienced a network security incident that impacted a limited portion of Aesto's Amazon Web Services infrastructure source
Through
Aesto, LLC Aesto, LLC ("Aesto") provides healthcare data migration and archiving services for healthcare providers and writes with important information regarding a recent data security incident at Aesto source · 12 organisations hit through Aesto →

What the letter says

Found
on May 26, 2026, Aesto confirmed that between on or about December 2, 2025, and December 18, 2025, a limited amount of your protected health information pertaining to your care, which was stored on Aesto's network, may have been accessed and/or acquired by an unauthorized actor
Began
between on or about December 2, 2025, and December 18, 2025, a limited amount of your protected health information pertaining to your care, which was stored on Aesto's network, may have been accessed and/or acquired by an unauthorized actor
Exposed
The information potentially impacted includes your full name, as well as your <<breached elements>>
At
Aesto, LLC ("Aesto") provides healthcare data migration and archiving services for healthcare providers and writes with important information regarding a recent data security incident at Aesto
Offered
out of an abundance of caution, to help protect your identity, it is offering a complimentary <<12/24>> month membership of Epiq Privacy Solutions ID

Got a letter or email about this breach? Check it is real →

Read the letter (PDF), as filed with the California Attorney General.

Sources

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

If Stanislaus County Health Services Agency had your data

  1. Look for Stanislaus County Health Services Agency’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 Stanislaus County Health Services Agency 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 Stanislaus County Health Services Agency, 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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Every breach in United States →

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.