AccidentalEducationEducationProgramming ErrorMisdeliveryCustomer Data InvolvedEmployee Data InvolvedIdentity (basic)EducationLowContained

Mount Diablo Unified School District

bd_aaf14349280f5592 · schema v1 · pii pii-v1

Severity

Low

Discovered

Sep 14, 2020

Filed

Oct 20, 2020

To disclose

5 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for Mount Diablo Unified School District →5 incidents on file

Mount Diablo Unified School District notified parents that a coding error in the SchoolMessenger mobile application (provided by Intrado) randomly disclosed contact information (names, emails, phone numbers) of other parents and students to users. The incident was discovered on September 14, 2020. The district immediately shut down access to the application and is investigating with the vendor. No evidence of misuse was found.

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California clockDiscovered Sep 14, 2020 → Notified Sep 21, 20207d ✓ CA 60-day OK5 weeks discovery → filing

Incident timeline

discovery → filing · 5 weeks / 36 days

Sep 14, 2020

Begins

Sep 14, 2020

Discovered

Oct 20, 2020

Filed

vs. sector median

3 wks faster

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

Name: Mount Diablo Unified School District
norm: mount diablo unified school district

Name: Mount Diablo Unified School District
norm: mount diablo unified school district
Industry: Educationllm

Discovered: Sep 14, 2020
Breach occurred: Sep 14, 2020
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Sep 21, 2020
Affected individuals: Not disclosed
Data types: Identity (basic)Education
Attack vector: Misconfiguration
Third party: via Intrado (SchoolMessenger)

During the incident: Immediately contacted Intrado to shut down all parent access to the SchoolMessenger application
Working with Intrado to investigate the specifics about what took place
Required Intrado to shut down the SchoolMessenger application pending resolution of the coding error
Changes made: Assessing overall security
Considering alternatives to the SchoolMessenger application
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 days from discovery to filing)
Compliance flags: CA 60-day OK · 7d
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: Sep 14, 2020
→ Notified: Sep 21, 2020
7d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Sep 14, 2020 → Notified: Sep 21, 2020	7d	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/sb24-195323
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Oct 20, 2020
Raw hash: 808a74049219a751ee80c86e51a7fe5c83cd057ad1cbd44dd92326546ee2b5ed

Reporting entityMount Diablo Unified School District

Victim entityMount Diablo Unified School District

Incidentdiscovered Sep 14, 2020

Stated responseImmediately contacted Intrado to shut down all parent access to the SchoolMessenger application

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov