El Camino Health Data Security Incident
What happened
El Camino Health experienced a data security incident involving unauthorized access to Microsoft 365 accounts. The investigation identified intermittent unauthorized access to the Microsoft 365 accounts for four employees between August 26, 2026 and September 2, 2026. On September 1, 2026, unusual activity was identified in the Microsoft 365 system. Certain documents were copied or downloaded from those accounts. As stated,
AI summary of accepted evidence. Check the original sources for the full context.
Reported impact
An affected population has not been established in the accepted evidence.
- Incident date
- 26 Aug 2026 – 2 Sept 2026
- Discovery date
- 1 Sept 2026
- Data access
- accessed
Source evidence
1Read the original reporting and statements. Multiple articles may rely on the same underlying source.
Organization notification filed with California Attorney General
Retrieved 5 Nov 2026
We are writing to inform you about a recent data security incident that involved some of your information.
Attributed reporting
3 more excerpts
The investigation identified intermittent unauthorized access to the Microsoft 365 accounts for four employees between August 26, 2026 and September 2, 2026
Attributed reporting
On September 1, 2026, we identified unusual activity in our Microsoft 365 system.
Attributed reporting
certain documents that were copied or downloaded from those accounts
Attributed reporting
Updates and corrections
All times UTCRevision 3
Incident date revised
Revision 2
Incident date revised
Revision 1
Incident published