HackingStolen CredentialsEmployee Data InvolvedCustomer Data InvolvedIDENTITY_BASICPIILowContained
Sunnyvale School District
bd_cf5893d5f3cf8a01 · schema v1 · pii pii-v1
Full breach record for Sunnyvale School District →Sunnyvale Elementary School District identified suspicious activity in its email environment in May 2025. Investigation determined unauthorized access to a limited number of employee email accounts. On September 23, 2025, the district determined that emails or attachments contained names and other data of affected individuals. The filing is a supplemental notice. The district engaged forensic experts, secured the environment, and is offering identity theft protection services.
California clockDiscovered May 1, 2025 → Notified Oct 1, 2025153d ✗ CA 60-day late25 weeks discovery → filing
Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident
Source provenance
- Source URL
- https://oag.ca.gov/ecrime/databreach/reports/sb24-613199
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
- Filed at
- Oct 22, 2025
- Raw hash
- f658f91d323c53c801ee6114d3a75616f707ef5228ace96ed727ee8e7dee9c17
Reporting entity
- Name
- Sunnyvale School Districtnorm: sunnyvale school district
- Domain
- sesd.org
Victim entity
- Name
- Sunnyvale School Districtnorm: sunnyvale school district
- Domain
- sesd.org
Incident
- Discovered
- May 1, 2025
- Materiality determined
- —
- Notification sent
- Oct 1, 2025
- Affected individuals
- Not disclosed
- Data types
- IDENTITY_BASICPII
- Attack vector
- Unauthorized Access
- MITRE ATT&CK
- T1078 Valid AccountsT1114 Email Collection
- Threat actor
- External
Compliance
- Time to disclose
- 25 weeks(174 days from discovery to filing)
- Compliance flags
- CA 60-day late · 153d
- Discovery-date grounding
- letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
- Clock breakdown
Statute Window Elapsed Threshold Status California Discovered: May 1, 2025→ Notified: Oct 1, 2025153d 60 days (analyst band, pre-2026 discoveries) CA 60-day late
Extraction provenance
- Status
- No extraction artifact recorded for this disclosure.