We recently addressed issues affecting Open With integrations within Box. We would like to take this opportunity to further explain these issues and the steps we have taken to prevent them from reoccurring.

Between 1:00 PM PDT and 2:40 PM PDT on July 16, 2026, some customers may have been unable to open or edit files using any Open With integration in the Box web application. During this period, affected files may have appeared unavailable or grayed out, and users may have encountered permission-related errors when launching an integration. Microsoft Office workflows, including Office Online in the browser and desktop editing through Box Edit, were among those impacted.

The issue occurred after a recent service update unintentionally changed how integration workflows were handled, causing the product to return an empty set of available integration actions for affected files. We resolved the issue by reverting the service to the previously deployed version, after which service metrics and customer confirmations recovered. In addition, we are taking steps to reduce reoccurrence by improving testing, monitoring, and release practices for integration paths.

Analysis

This incident highlighted opportunities to improve end-to-end testing for integration workflows and our automated detection process.

The failure mode returned an empty action list rather than hard errors, which kept broad service-level signals near baseline and made the impact visible primarily through customer reports.

Corrective Actions

Box has initiated the following corrective actions:

• Expanded lower-environment end-to-end tests to validate Open With / Office Online behaviors after changes to integration-related code.
• Added targeted monitoring and alerting for integration action and permission-check failures so regressions surface automatically.
• Documented and formalized release and rollback runbooks for integration-related changes, including clear validation and rollback steps to reduce time-to-recovery.

We are continuously working to improve Box and want to make sure we are delivering the best product and user experience we can. We hope we have provided some clarity here and we would be happy to answer any questions you may still have regarding this matter.

Sincerely,

The Box Team