Summary
- Environment: Healthcare migration and archiving infrastructure hosted on AWS
- Operational impact: Personal information potentially accessed or acquired
- Financial impact: No incident cost disclosed
- Record status: Developing record. Reviewed November 4, 2026; updated as evidence emerges.
What happened
Aesto, LLC reported a security incident affecting part of its Amazon Web Services infrastructure around December 18, 2025. [1]
Impact
On May 26, 2026, Aesto concluded that personal information may have been accessed or acquired between December 2 and December 18, 2025. [1]
The notification template identifies names but leaves other affected fields and healthcare-provider identities variable. It does not establish a total affected population. [1]
Timeline
Potential data impact confirmed
Potential data impact confirmed, according to the published account. Incident notice.
[1]Briefing updated
This briefing was last reviewed and updated on November 4, 2026.
Threat Group & Attack Vector
The reviewed notice does not establish the initial access method.
Actors
- No threat actor group has been identified in the reviewed public evidence.
TTPs
- No specific MITRE ATT&CK technique is currently mapped for this case.
Response
Aesto engaged outside cybersecurity specialists, investigated and reviewed documents, and offered identity monitoring. It reported no evidence of misuse. [1]