Data breach

San Bernardino County on behalf of Arrowhead Regional Medical Center

Location not known1 source

NotifiedSan Bernardino County on behalf of Arrowhead Regional Medical Center notified the California Attorney General of a data breach on 28 Sept 2026. The cause was not stated.

Open the live map Am I affected?

Location not known.

Sector: Healthcare
First reported: 28 Sept 2026
Latest source: 28 Sept 2026

What is known

Confirmed

No confirmed figure

Claimed

No claimed figure

Data involved

Data types not stated

Cause

Cause not stated

Attack: 28 Aug 2026
Disclosed: 28 Sept 2026
First seen by Black Shard: 9 Nov 2026

Filings

California Attorney General28 Sept 2026Breach notice

Sources

California Attorney GeneralPrimary source28 Sept 2026California Attorney General breach notice sb24-630484

Status timeline

28 Sept 2026
California Attorney General, primary source
28 Sept 2026
Status: notified

What to do

If you have an account, change that password, and anywhere you reused it.
Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
If payment cards were involved, watch statements and ask your bank for a new card.
If government ID or social security numbers were involved, consider a credit freeze.

Talk to our team 24/7 incident line: 1800 370 270

How sure we are

That it happened as stated 90%

The place 0%

1 independent source. Location not known.

Not known yet

Number of recordsData involvedWho did it

Update log

9 Nov 2026First seen.

Under attack? Call the incident line.

Black Shard's team can check your exposure, take a fix off your plate or step in on a live incident.

Talk to our team Breach response

24/7 incident line1800 370 270Call first, then work through the first-hour steps.