Our takeMicrosoft shipped Windows 10 KB5099539, the July 2026 ESU rollup with that month’s Patch Tuesday fixes. If you still run Windows 10 under Extended Security Updates, install it.Cyber Resilience desk
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What this means for you — Security leader:Deploy KB5099539 to Windows 10 ESU endpoints on your normal Patch Tuesday cadence; prioritize internet-facing and high-value systems. Map the 570 fixed CVEs against your remaining Win10 estate and confirm ESU entitlement before rollout.
What this means for you — Lean IT orgs:If you still run Windows 10 under extended security updates, install KB5099539 via Windows Update now. If you have already moved to Windows 11, this package does not apply.
What this means for you — MSP:Push KB5099539 to enrolled Windows 10 ESU clients; verify ESU activation per tenant before deploying. Inventory which clients still have Win10 endpoints so you can track residual exposure after this cycle.
What this means for you — Researcher:KB5099539 ships the July 2026 Patch Tuesday set (570 CVEs) plus ESU-only fixes for Windows 10. Diff against the mainstream Win11/Server bulletins for channel-specific deltas.