iOS 26.4.1 was released today. Although the official release notes are vague, a thread on developer forums indicates that this update actually fixes a significant bug related to iCloud data synchronization.

Developers noticed that iPhones running version 26.4 had stopped receiving iCloud change notifications. This situation affected cloud data synchronization for applications using the CloudKit framework, including Apple’s own Passwords app. Apple has now addressed this regression with the newly released iOS 26.4.1 version.

Although the iCloud issue affected many third-party applications, it was overlooked for a while. For instance, applications dependent on the CloudKit framework, such as Drafts, were impacted by this situation.

This issue meant that changes made on one device were not automatically communicated to iPhone and iPad clients. Affected developers could do nothing but send bug reports to Apple and had to wait for the company to fix the operating system; that has now happened.

Not only third-party applications but also some Apple services dependent on the CloudKit infrastructure were affected by this bug. In particular, the shared passwords feature in the Apple Passwords app was impacted by this situation.

If you have been experiencing data synchronization issues with your iPhone applications recently and your device is running iOS 26.4.0, try updating to iOS 26.4.1. This bug was also present in iPadOS 26.4.0, but macOS Tahoe 26.4 did not encounter the same issue.

You can update your phone now; go to Settings -> General -> Software Update to install 26.4.1. If you are in the beta program, the issue has already been fixed in the latest iOS 26.5 version.