Thank you for using the CASIO WATCHES smartphone app.

A critical security issue has been discovered in PHP, a programming language that powers web services worldwide.
Because parts of our CASIO WATCHES service utilize PHP, we have temporarily suspended the affected functions/services as a precautionary measure to protect our customers’ information.

At this time, we have not confirmed any unauthorized access to, or information leakage from, CASIO WATCHES.

■ Service Suspension Period

Suspension start: Wednesday, October 21, 2026 (JST)

Note: We are working to restore service as quickly as possible.

This matter relates to technology widely used across web services worldwide and is not specific to our company.

We sincerely apologize for the inconvenience caused by this sudden service suspension.
We appreciate your understanding as we work to ensure the safe provision of our services.

Note: Official information on PHP: PHP: News Archive - 2026

＜Updated October 29, 2026＞
Due to the impact of security measures related to PHP, we have confirmed that on certain screens within CASIO WATCHES, a maintenance screen is displayed instead of the watch operation screen that would normally appear.

Even while the maintenance screen is being displayed, you can continue to use basic functions—such as pairing/connecting with the watch and changing watch settings—without any issues.
For pairing/connection instructions, please refer to the PDF version of the user manual searchable via Manuals | Watches, rather than the “Instruction Manual” button within the app.
Once this issue has been resolved, the normal screen will be displayed instead of the maintenance screen.

We apologize for any inconvenience this may cause.

If you have any questions, please contact us here.