---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-137241"
form_type: "8-K"
ticker: "WDC"
cik: "0000106040"
company_name: "WESTERN DIGITAL CORP"
filed_at: "2023-05-05T23:59:59+00:00"
generated_at: "2026-06-15T15:42:53.301931+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.85
calibrated_materiality_score: 0.85
confidence: "high"
source: SEC EDGAR
---

# Western Digital discloses network breach affecting online store customer data

## Summary
- Unauthorized third party accessed Western Digital systems on March 26, 2023; discovered same day, disclosed April 2.
- Customer data obtained includes names, addresses, emails, phone numbers; encrypted passwords and partial credit card numbers.
- My Cloud service restored April 13; online store access expected restored week of May 15, 2023.
- Factories remained operational throughout; company is shipping products to meet customer needs.
- Investigation ongoing with outside forensic experts; company will communicate directly with impacted customers.

## SEC filing metadata
- accession: 0001193125-23-137241
- form_type: 8-K
- ticker: WDC
- cik: 0000106040
- company_name: WESTERN DIGITAL CORP
- filed_at: 2023-05-05T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.85
- calibrated_materiality_score: 0.85
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/106040/000119312523137241/0001193125-23-137241-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/106040/000119312523137241/d353351d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-137241
- JSON: https://secwatch.observer/filing/0001193125-23-137241.json
- Plain text: https://secwatch.observer/filing/0001193125-23-137241.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.