Patch tracker / KB5094127
KB5094127: Windows 11 Version 26H1 for ARM64-base Security Update (August 2026)
KB5094127 is a Critical security update for Windows 11 Version 26H1 for ARM64-base, released 2026-08-11. It closes 149 CVEs with a maximum CVSS of 9.8. The most likely of them to be attacked is CVE-2026-33834, which FIRST.org rates at 80% probability of exploitation in the next 30 days.
Update summary
Fixes 149 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 54%. Among the top 25% of tracked Microsoft updates by EPSS exploit probability.
Microsoft documents 4 known issues with this update.
- Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key
- Microsoft Office applications might fail to open from certain third-party apps
- Deleting from Recycle Bin displays an internal file name
KB5094127 is a large June 2026 rollup for Windows 10 1809 and Windows Server 2019 that closes 148 CVEs, topped by a Critical issue rated CVSS 9.8. One flaw carries a 54% EPSS score, meaning exploitation in the wild is more probable than not even though none of these CVEs are in CISA KEV or tied to ransomware yet. The combination of a large CVE count and a near-coin-flip exploit likelihood on the worst bug makes this a priority for any remaining 1809 and Server 2019 fleets.
Do this: Deploy KB5094127 to all Windows 10 1809 and Windows Server 2019 systems this cycle, prioritizing internet-facing Server 2019 hosts first.
AI-generated from public data, 2026-07-26. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5094127
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5094127
- Released
- 2026-06-09
- Last changed
- 2026-08-11
- Changes tracked
- 3
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Check if KB5094127 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5094127 (checked 2026-08-26). Verify against the article before acting.
Devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key
Symptoms
Some devices with an unrecommended BitLocker Group Policy configuration might be required to enter their BitLocker recovery key on the first restart after installing this update.
This issue only affects a limited number of systems in which ALL the following conditions are true. These conditions are unlikely to be found on personal devices not managed by IT departments.
BitLocker is enabled on the OS drive.
The Group Policy " Configure TPM platform validation profile for native UEFI firmware configurations " is configured, and PCR7 is included in the validation profile (or the equivalent registry key is set manually).
System Information ( msinfo32.exe ) reports Secure Boot State PCR7 Binding as " Not Possible ".
The Windows UEFI CA 2023 certificate is present in the device’s Secure Boot Signature Database (DB), making the device eligible for the 2023‑signed Windows Boot Manager to be made the default.
The device is not already running the 2023-signed Windows Boot Manager.
In this scenario, the BitLocker recovery key only needs to be entered once -- subsequent restarts will not trigger a BitLocker recovery screen, as long as the group policy configuration remains unchanged. For help finding your BitLocker recovery key, see the article, Find your ...
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
Scope and sources
- Affected products
- Also released in August 2026
KB5002882
39 CVEs · Critical · exploitedKB5002883
40 CVEs · Critical · exploitedKB5002891
40 CVEs · Critical · exploitedKB5120228
215 CVEs · Critical · exploitedKB5120229
195 CVEs · Critical · exploitedKB5120233
215 CVEs · Critical · exploitedKB5120238
183 CVEs · Critical · exploitedKB5120240
171 CVEs · Critical · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.