Microsoft: September updates break File History backup feature
Summary
Microsoft has released its September 2026 security updates, and a new advisory warns that these updates may cause the built-in File History backup feature in Windows to malfunction on some systems. This issue affects the reliability of a core Windows backup tool, potentially leading to data loss if users aren't aware or don't take precautions.
IFF Assessment
This is bad news for defenders as a core Windows backup feature has been broken by a security update, potentially impacting data integrity and recovery capabilities.
Defender Context
Defenders should be aware of potential issues with Windows File History after applying the September 2026 security updates. It's crucial to test backups and consider alternative backup solutions or manual data synchronization methods until Microsoft releases a fix. This incident highlights the importance of thorough testing of all updates, especially those impacting critical system functionalities.