Patch tracker / KB5073722
KB5073722: Windows Server 2019 Security Update (January 2026)
KB5073722 is a Critical security update for Windows Server 2019, released 2026-01-13. It closes 54 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. The most likely of them to be attacked is CVE-2026-21265, which FIRST.org rates at 75% probability of exploitation in the next 30 days.
Update summary
Fixes 54 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 75%. Among the top 10% of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Windows 10 Version 1809 for 32-bit Systems has shipped since this one: KB5094041 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
Microsoft documents 1 known issue with this update.
- We are currently not aware of any issues with this update.
KB5073722 is a January 2026 rollup for Windows 10 1809 and Server 2019 that closes 54 CVEs, topped by a Critical issue at CVSS 9.8 with a 74 percent EPSS score, meaning exploitation is statistically likely. One of these CVEs is already on the CISA KEV list, so it is being exploited in the wild even though none are tied to ransomware yet. Server 2019 domain controllers and any legacy 1809 endpoints still in production are the exposed surface here.
Do this: Deploy KB5073722 to all Windows Server 2019 and Windows 10 1809 systems now, prioritizing the KEV-listed CVE on internet-facing and domain controller hosts.
AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5073722
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5073722
- Released
- 2026-01-13
- Last changed
- 2026-08-04
- 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 KB5073722 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5073722 (checked 2026-07-22). Verify against the article before acting.
We are currently not aware of any issues with this update.
Applies to: Win 10 Ent LTSB 2016
This security update includes fixes and improvements that are a part of the following update:
December 9, 2025—KB5071543 (OS Build 14393.8688)
December 18, 2025—KB5074974 (OS Build 14393.8692) Out-of-band
The following is a summary of the issues that this update addresses. The bold text within the brackets indicates the item or area of the change we are documenting.
[Credentials autofill] This update introduces a security hardening behavior restricting certain applications to autofill credentials during remote support sessions or automated authentication workflows. With this change, credential dialogs do not respond to virtual keyboard input from remote desktop or screen sharing tools or apps. For more information, see New behavior restricting certain applications to autofill credentials introduced by the Windows January 2026 security update .
[Drivers] This update removes the following modem drivers: agrsm64.sys (x64), agrsm.sys (x86), smserl64.sys (x64) and smserial.sys (x86). Modem hardware dependent on these specific drivers will no longer work in Windows.
[WinSqlite3.dll] Fixed: The Windows core component, WinSqlite3.dll, has been updated. Previously, some security software might have detected this component as vulnerable.
Note
WinSqlite3.dll is a separate component from ...
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 January 2026
KB5002822
6 CVEs · Critical · exploitedKB5002825
7 CVEs · Critical · exploitedKB5002828
7 CVEs · Critical · exploitedKB5073379
86 CVEs · Critical · exploitedKB5073450
80 CVEs · Critical · exploitedKB5073455
80 CVEs · Critical · exploitedKB5073457
78 CVEs · Critical · exploitedKB5073723
73 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.