Microsoft’s first Windows 11 security patch of 2026 introduced a serious bug.
Certain systems couldn’t shut down or hibernate properly after the update.
Users also reported failing to sign in via Remote Desktop connections.
The shutdown issue especially hit Windows 11 23H2 Enterprise and IoT editions.
Microsoft deployed an out-of-band update to resolve these problems.
This isn’t the first emergency fix Windows has needed in recent months.
Some remote connection apps and credentials failures affected larger setups.
Keeping updates current matters — but bugs highlight ongoing quality control concerns.