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

Yuba City Unified School District

bd_8f5d6354ae730768 · schema v1 · pii pii-v1

Severity

Low

Discovered

May 6, 2020

Filed

Jun 11, 2020

To disclose

5 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for Yuba City Unified School District →

Yuba City Unified School District notified parents that an unauthorized individual exploited a vulnerability in the Aeries Student Information System software. The exploit occurred in late November 2019, but the District learned of potential access on May 6, 2020. Affected data included parent/student names, addresses, phone numbers, emails, and hashed passwords. Passwords were reset, and the software patch was installed.

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California clockDiscovered May 6, 2020 → Notified May 6, 20200d ✓ CA 60-day OK5 weeks discovery → filing

Incident timeline

undetected · 187 days

discovery → filing · 5 weeks / 36 days

Nov 1, 2019

Begins

May 6, 2020

Discovered

Jun 11, 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.ConfirmedView incident

Name: Yuba City Unified School District
norm: yuba city unified school district
Domain: ycusd.org

Name: Yuba City Unified School District
norm: yuba city unified school district
Domain: ycusd.org
Industry: Educationllm

Discovered: May 6, 2020
Breach occurred: Nov 1, 2019 – Nov 30, 2019
Undetected for: 187 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 6, 2020
Affected individuals: Not disclosed
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
Initial access: supply_chain

During the incident: Reset all passwords for the District’s Aeries System
Requiring all account holders to create a new password
Law enforcement launched an investigation
Changes made: Installed the software patch that Aeries made available to remedy the vulnerability
Reviewing existing policies and procedures to mitigate any risk
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 · 0d
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 6, 2020
→ Notified: May 6, 2020
0d 60 days (analyst band, pre-2026 discoveries) CA 60-day OK

Statute	Window	Elapsed	Threshold	Status
California	Discovered: May 6, 2020 → Notified: May 6, 2020	0d	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/sb24-190824
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jun 11, 2020
Raw hash: 460cd88d178732a032164ea2eadbae0092abb7c72c0dd84f2b69b75ffdaa1692

Reporting entityYuba City Unified School District

Victim entityYuba City Unified School District

Incidentdiscovered May 6, 2020

Stated responseReset all passwords for the District’s Aeries System

ComplianceCA 60-day OK

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov