UnknownEducationEducationEmployee Data InvolvedIdentity (basic)Government IDHealth (basic)Financial accountMediumActive

Monterey Peninsula Unified School District

bd_f23493507b390407 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Nov 1, 2021

Filed

Dec 21, 2021

To disclose

7 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

65%

Full breach record for Monterey Peninsula Unified School District →

Monterey Peninsula Unified School District notified individuals of unauthorized access to its network discovered on November 1, 2021. The investigation determined that files containing current and former employee information, including names, Social Security numbers, medical information, and financial account information, were potentially impacted. The district changed passwords, enhanced security protocols, and engaged third-party specialists. The investigation remains ongoing. No evidence of misuse was found. Credit monitoring was offered.

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California clockDiscovered Nov 1, 2021 → Notified Dec 21, 202150d ✓ CA 60-day OK7 weeks discovery → filing

Incident timeline

discovery → filing · 7 weeks / 50 days

Nov 1, 2021

Begins

Nov 1, 2021

Discovered

Dec 21, 2021

Filed

vs. sector median

1 wks faster

This filing is one of 2 about the same incident.View merged incident

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitelockbit2bd_049360d7467c03222021-11-25 · +26dVerified by operator

Name: Monterey Peninsula Unified School District
norm: monterey peninsula unified school district
Domain: mpusd.net

Name: Monterey Peninsula Unified School District
norm: monterey peninsula unified school district
Domain: mpusd.net
Industry: Educationllm

Discovered: Nov 1, 2021
Breach occurred: Nov 1, 2021
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Dec 21, 2021
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDHealth (basic)Financial account
Data elements: Social Security numberMedical information
Attack vector: Unknown

During the incident: Changed account passwords
Enhanced security protocols
Working with third party specialists to harden our network
Reviewing our policies and procedures related to data protection
Providing 12 months of credit monitoring and identity protection services through Cyberscout
Changes made: Working with third party specialists to harden our network
Reviewing our policies and procedures related to data protection
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 7 weeks(50 days from discovery to filing)
Compliance flags: CA 60-day OK · 50d
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: Nov 1, 2021
→ Notified: Dec 21, 2021
50d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Nov 1, 2021 → Notified: Dec 21, 2021	50d	60 days (analyst band, pre-2026 discoveries)	CA 60-day OK

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/sb24-548782
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Dec 21, 2021
Raw hash: 20736cdd46fc481dff59b0e12c3e182462359ca8769713d873726bc322d32173

Linked disclosures

Ransomware claims (1)

Reporting entityMonterey Peninsula Unified School District

Victim entityMonterey Peninsula Unified School District

Incidentdiscovered Nov 1, 2021

Stated responseChanged account passwords

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov