HackingEducationEducationVulnerability ExploitSupply Chain (3P Vendor)Customer Data InvolvedEmployee Data InvolvedIdentity (basic)CredentialsMediumResolved

Adelanto Elementary School District

bd_f966d079a76be9a8 · schema v1 · pii pii-v1

Severity

Medium

Discovered

Apr 27, 2020

Filed

Jun 26, 2020

To disclose

9 weeks

Affected

7,559state residents only

Confidence

64%

Full breach record for Adelanto Elementary School District →

Adelanto Elementary School District notified parents of a data breach involving the Aeries Student Information System. An unauthorized individual exploited a vulnerability in the Aeries software in late November 2019, gaining access to student and parent information including names, addresses, phone numbers, email addresses, and hashed passwords. Aeries notified districts in April 2020. The district required password changes and installed security patches.

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California clockDiscovered Apr 27, 2020 → Notified Jun 26, 202060d ✓ CA 60-day OK9 weeks discovery → filing

Incident timeline

undetected · 175 days

discovery → filing · 9 weeks / 60 days

Nov 4, 2019

Begins

Apr 27, 2020

Discovered

Jun 26, 2020

Filed

Part of Aeries supply-chain incident (2020) — a supply-chain cascade affecting multiple organizations.View cascade →

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed7,559 affectedView incident

Name: Adelanto Elementary School District
norm: adelanto elementary school district
Domain: aesd.net

Name: Adelanto Elementary School District
norm: adelanto elementary school district
Domain: aesd.net
Industry: Educationllm

Discovered: Apr 27, 2020
Breach occurred: Nov 4, 2019
Undetected for: 175 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jun 26, 2020
Affected individuals: 7,559state-resident count only
Data types: Identity (basic)Credentials
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1195 Supply Chain Compromise
Threat actor: External
Third party: via Aeries Software
Initial access: supply_chain

During the incident: Required all account holders whose accounts were involved to change their passwords
Installed the software patch that Aeries made available to remedy the vulnerability
Reviewing existing policies and procedures to mitigate any risk associated with this incident
Changes made: Installed the software patch that Aeries made available to remedy the vulnerability
Reviewing existing policies and procedures to mitigate any risk associated with this incident and to better prevent future incidents
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 9 weeks(60 days from discovery to filing)
Compliance flags: CA 60-day OK · 60d
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: Apr 27, 2020
→ Notified: Jun 26, 2020
60d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Apr 27, 2020 → Notified: Jun 26, 2020	60d	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/sb24-191465
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 26, 2020
Raw hash: 44a7cb9cf038450824db87d006866cc8f6b93a5233c0b4954dc271686c284617

Reporting entityAdelanto Elementary School District

Victim entityAdelanto Elementary School District

Incidentdiscovered Apr 27, 2020

Stated responseRequired all account holders whose accounts were involved to change their passwords

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov