HarbisonWalker International, a Pittsburgh-based refractory products manufacturer, notified individuals on September 22, 2026, about a cybersecurity incident involving its internal network. The notification stated that the incident may have affected some personal information. HarbisonWalker International reported the incident to government authorities and federal law enforcement agencies, but the notification did not provide a date for the network intrusion or discovery of the incident.
The company has not publicly disclosed an affected-person count or a specific list of compromised data types, including whether Social Security numbers, medical information, or financial information were involved. The notice offered potentially affected individuals 24 months of credit monitoring and identity theft protection. Further incident details may emerge as the company continues its review and provides notices.