Notice of the suspension of the “EneTelus” website and services due to measures to address PHP vulnerabilities | DIAMOND ELECTRIC HOLDINGS Co.,Ltd. (6699) timely disclosure

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Temporary Suspension of the “EneTelus” Website and Services Due to a PHP Vulnerability

Subject Entity

Dia Zebra Electric

Target Locations / Products

EneTelus website, EIBS No. 8 special website, Dia Zebra Electric partner page, EIBS warranty certificate application website, EneTelus-cloud (PC), EneTelus-cloud (mobile web), and software update service

Occurrence21 October 2026 (Wednesday)

This disclosure10/22/2026

Cause

A vulnerability in the PHP programming language announced on The PHP Group’s official website

Company response

Suspended operations

Use of and updates to EneTelus-related websites, EIBS warranty certificate applications, EneTelus-cloud (PC and mobile web), and the software update service have been suspended.

Scheduled resumption date

Undecided

Outlook

The affected services will be resumed in stages after their safety has been confirmed. The resumption date has not been determined.

Event that occurred
Item	Details
Event name	Temporary Suspension of the “EneTelus” Website and Services Due to a PHP Vulnerability
Date of occurrence	21 October 2026 (Wednesday)
Subject Entity	Dia Zebra Electric
Target Locations / Products	EneTelus website, EIBS No. 8 special website, Dia Zebra Electric partner page, EIBS warranty certificate application website, EneTelus-cloud (PC), EneTelus-cloud (mobile web), and software update service
Cause	A vulnerability in the PHP programming language announced on The PHP Group’s official website
Suspended operations	Use of and updates to EneTelus-related websites, EIBS warranty certificate applications, EneTelus-cloud (PC and mobile web), and the software update service have been suspended.
Scheduled resumption date	Undecided
Outlook	The affected services will be resumed in stages after their safety has been confirmed. The resumption date has not been determined.

Items this document does not state (17)

Date recognized / date notice receivedAmount of Impact on Business PerformanceAccounting period in which recognizedImpact on Earnings ForecastType of litigation or proceedingCourt or authorityPlaintiffDefendantDate of filing / date of actionClaim amount / surcharge amountAmount of receivables at risk of non-collection or delayed collectionInvestigation structureMeasures to prevent recurrenceDirectors' and officers' liabilityVoting rights ownership percentage before the changeVoting rights ownership percentage after the changePlanned follow-up disclosure

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The reasons the company gives

The company's own explanation, not something inferred from the numbers.

In response to the vulnerability in the PHP programming language announced on The PHP Group’s official website, the company is prioritizing the protection of customer information and the prevention of harm.

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