IEH discloses Microsoft 365 mailbox breach after phishing attack

• IEH disclosed a cybersecurity incident discovered Aug. 4, 2026 involving unauthorized access to an employee’s Microsoft 365 mailbox.
• The breach stemmed from a phishing attack that captured login credentials via a fraudulent Microsoft document-sharing link.
• The intruder could access email content, including customer communications, purchase orders, engineering documentation, and potentially export-controlled technical information.
• IEH reported no evidence that data was sent externally, downloaded, or exfiltrated, though information was accessible during the compromise period.
• The mailbox was secured, malicious rules were disabled, evidence preserved, and additional Microsoft 365 security controls are under review.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. IEH Corporation published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001174947-26-000761), on August 06, 2026, and is solely responsible for the information contained therein.