Windows 11 KB5134133 provides an out-of-band trusted-root update
🛠️ Microsoft released KB5134133, a non-security cumulative out-of-band update for Windows 11 versions 24H2, 25H2 and 26H2, on October 26.
It includes an updated trusted-root payload for devices that have not received the current certificate trust list, including disconnected environments or systems where automatic trust-list updates are unavailable or disabled.
The support article also documents known issues affecting certain Smart App Control, Remote Desktop and USB audio scenarios. This is a targeted servicing update; the published applicability and known issues remain relevant to deployment planning.
Partner briefing
- What it is
A Windows 11 out-of-band cumulative update.
- What’s changing
Updated trusted-root data for affected Windows 11 releases.
- Why it matters
Addresses devices that cannot obtain current certificate trust lists through normal updates.
- Who it affects
Windows administrators and partners maintaining affected client devices.