HackingEducationEducationStolen CredentialsEmployee Data InvolvedCustomer Data InvolvedIdentity (basic)PIILowContained

Sunnyvale School District

bd_cf5893d5f3cf8a01 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 1, 2025

Filed

Oct 22, 2025

To disclose

25 weeks

Affected

Not disclosed

Confidence

66%

Full breach record for Sunnyvale School District →2 incidents on file

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.

J jump to incidentP pin to compareR raw source

California clockDiscovered May 1, 2025 → Notified Oct 1, 2025153d ✗ CA 60-day late25 weeks discovery → filing

Incident timeline

discovery → filing · 25 weeks / 174 days

May 1, 2025

Discovered

Oct 22, 2025

Filed

vs. sector median

+18 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Sunnyvale School District
norm: sunnyvale school district
Domain: sesd.org

Name: Sunnyvale School District
norm: sunnyvale school district
Domain: sesd.org
Industry: Educationllm

Discovered: May 1, 2025
Materiality determined: —
Notification sent: Oct 1, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)PII
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid AccountsT1114 Email Collection
Threat actor: External

During the incident: Took immediate steps to secure the email environment
Engaged outside computer forensic experts to assist
Offering identity theft protection services through IDX, which include: 12/24 months of credit and CyberScan monitoring, a $1,000,000 insurance reimbursement policy, and fully managed identity theft recovery services
Changes made: Implemented, and will continue to adopt, additional safeguards and technical security measures to further protect and monitor our systems
Source: Quoted from the filing itself, not independently verified.

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, 2025
153d 60 days (analyst band, pre-2026 discoveries) CA 60-day late

Statute	Window	Elapsed	Threshold	Status
California	Discovered: May 1, 2025 → Notified: Oct 1, 2025	153d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

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 entitySunnyvale School District

Victim entitySunnyvale School District

Incidentdiscovered May 1, 2025

Stated responseTook immediate steps to secure the email environment

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov