IEH Corporation (OTCQX: IEHC) reports Microsoft 365 email incident

IEH Corporation reported a cybersecurity incident discovered on August 4, 2026, involving unauthorized access to a Microsoft 365 mailbox following a phishing attack. A threat actor obtained an employee’s credentials and could view emails, attachments, customer communications, purchase orders, engineering documents, and potentially export-controlled technical information.

IEH states there is no current evidence that information was transmitted externally, downloaded, or that emails were sent from the compromised account, though sensitive data was accessible during the compromise period. The account has been secured, malicious mailbox rules disabled, and Microsoft 365 security controls are under review. IEH is analyzing impacted communications, will notify affected parties and regulators if required, believes the incident will not have a material adverse effect on business operations, and continues its investigation.

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of report (Date of earliest event reported): August 4, 2026

(Exact Name of Registrant as Specified in Charter)

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Securities registered pursuant to Section 12(b) of the Act:

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On August 4, 2026, IEH Corporation (“IEH” or the “Company”) discovered that it sustained a cybersecurity incident whereby a threat actor using an alias gained unauthorized access to the Microsoft 365 mailbox of an employee of the Company. As soon as the incident was observed, the Company took action to contain the unauthorized access.

An investigation determined the compromise originated from a phishing attack in which a malicious actor impersonated a prospective business and delivered a hyperlink disguised as a Microsoft document-sharing link. The user accessed the link and entered Microsoft 365 credentials into a fraudulent login page, resulting in unauthorized account access.

The threat actor gained access to mailbox contents, including email messages, attachments, customer communications, purchase orders, engineering-related documentation, and potentially export-controlled technical information. No evidence currently exists that unauthorized emails were transmitted from the account or that data was successfully exfiltrated. However, sensitive information was accessible to the unauthorized party during the compromise period.

The account was secured, malicious mailbox rules were disabled, evidence was preserved, and corrective actions are underway.

Following containment and investigation activities, the Company initiated a review of account security controls and authentication protections applicable to Microsoft 365 services. The Company has already taken and completed a series of corrective actions to contain any impact of the unauthorized access.

However, at this time, the Company has no evidence that information was transmitted externally, downloaded or infiltrated. The Company only knows that the information was accessible to the unauthorized actor during the compromise period.

The Company is continuing to review the impacted communications and will provide, if necessary, any required notifications to affected parties and applicable regulatory agencies.

As of the date of this filing on Form 8-K, the Company believes that the incident will not have a material adverse effect on its business operations. The Company is continuing to investigate the incident.

Cautionary Statement Regarding Forward Looking Statements

Certain of the statements included in this Report constitute forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. Forward-looking statements are made based on management’s current expectations and beliefs concerning future developments and their potential effects upon the Company and its subsidiaries. The Company’s actual results may differ, possibly materially, from expectations or estimates reflected in such forward-looking statements. Certain important factors that could cause actual results to differ, possibly materially, from expectations or estimates reflected in such forward-looking statements can be found in the “Risk Factors” and “Forward-Looking Statements” sections included in the Company’s Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q. The Company does not undertake to update any particular forward-looking statement included in this document.

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Source: View Original Filing on SEC EDGAR