MisuseTechnologyRetail & ConsumerInformationData MishandlingEmployee Data InvolvedIdentity (basic)Government IDPIIHighResolved

ZILLOW, INC.

bd_cd9ff8997ba832b5 · schema v1 · pii pii-v1

Severity

High

Discovered

May 9, 2017

Filed

May 19, 2017

To disclose

10 days

Affected

1,086state residents only

Confidence

71%

Full breach record for ZILLOW, INC. →

Zillow Group reported a data breach on May 9, 2017, where a former employee inadvertently received a copy of a customer's 2015 W-2 form due to a clerical error. The incident involved the inadvertent disclosure of names, addresses, Social Security Numbers, and wage/tax information. Zillow discovered the error on the same day, confirmed the former employee did not retain or share the data, and notified 1,086 affected individuals. The company provided one year of identity monitoring services through Kroll.

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Incident timeline

discovery → filing · 10 days

May 9, 2017

Begins

May 9, 2017

Discovered

May 19, 2017

Filed

vs. sector median

9 wks faster

Tracked as a single-filing incident — the only disclosure on record for this event so far.Confirmed1,086 affectedView incident

Name: ZILLOW, INC.
norm: zillow

Name: ZILLOW, INC.
norm: zillow
Industry: TechnologyllmRetail & Consumerllm

Discovered: May 9, 2017
Breach occurred: May 9, 2017
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: May 19, 2017
Affected individuals: 1,086state-resident count only
Data types: Identity (basic)Government IDPII
Data elements: Social Security numberName
WA-stated cause: Theft or Mistake
WA-stated duration: lifecycle 0dexposure 0d
WA-stated discovery: Found while ongoingContained same day
Attack vector: Insider
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: Internal
Initial access: insider_action

During the incident: Contacted the former employee who received a copy of your document and confirmed that the information was not shared or retained
Initiated a review of our security procedures and protocols
Implemented changes to reduce the possibility of this happening again
Arranged to provide, at no cost to you, one year of identity monitoring services through Kroll
Changes made: Initiated a review of our security procedures and protocols
Implemented changes to reduce the possibility of this happening again
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 10 days(10 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

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://agportal-s3bucket.s3.amazonaws.com/databreach/BreachM9706.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 19, 2017
Raw hash: 81d8fd75b9c25d4eb4951e69853c0619c70009f930247d6cd32015937dbd2172

Reporting entityZILLOW, INC.

Victim entityZILLOW, INC.

Incidentdiscovered May 9, 2017

Stated responseContacted the former employee who received a copy of your document and confirmed that the information was not shared or retained

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenanceagportal-s3bucket.s3.amazonaws.com