---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-23-088802"
form_type: "8-K"
ticker: "WDC"
cik: "0000106040"
company_name: "WESTERN DIGITAL CORP"
filed_at: "2023-04-03T23:59:59+00:00"
generated_at: "2026-06-17T06:46:14.009469+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Western Digital discloses network security incident; unauthorized access, data possibly taken

## Summary
- Incident discovered on March 26, 2023; unauthorized third party gained access to systems.
- Investigation ongoing with outside security experts and law enforcement coordination.
- Company took systems and services offline; restoring impacted infrastructure, causing business disruption.
- Unauthorized party obtained certain data; nature and scope of data under investigation.
- No specifics on customer or financial data impact disclosed yet.

## SEC filing metadata
- accession: 0001193125-23-088802
- form_type: 8-K
- ticker: WDC
- cik: 0000106040
- company_name: WESTERN DIGITAL CORP
- filed_at: 2023-04-03T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/106040/000119312523088802/0001193125-23-088802-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/106040/000119312523088802/d453102d8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-23-088802
- JSON: https://secwatch.observer/filing/0001193125-23-088802.json
- Plain text: https://secwatch.observer/filing/0001193125-23-088802.txt

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