Microsoft has confirmed a new known issue causing delivery delays for June 2025 Windows security updates due to an incorrect metadata timestamp.

As Redmond explains in recent advisory updates, this bug affects Windows 10 and Windows 11 systems in environments with quality update deferral policies that enable admins to delay update installation on managed devices.

While update deployment delays are an expected result when using such policies, the wrong timestamp for the June security updates will postpone them beyond the period specified by administrators, potentially exposing unpatched systems to attacks.