Patch tracker / KB5073696
KB5073696: Windows Server 2019 Security Update (January 2026)
KB5073696 is a High security update for Windows Server 2019, released 2026-01-13. It closes 37 CVEs with a maximum CVSS of 8.8. 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 37 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 20%. Among the top half 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.
KB5073696 is the January 13, 2026 rollup for Windows 10 version 1809 and Windows Server 2019, fixing 37 CVEs with a top Severity of High (CVSS 8.8). One of these CVEs is already listed in the CISA KEV catalog, meaning it is confirmed exploited in the wild, though none are currently tied to ransomware. The highest EPSS across the set is 19%, so the KEV entry is the concrete driver here rather than statistical exploit probability.
Do this: Deploy KB5073696 to all 1809 and Server 2019 hosts now, prioritizing internet-facing servers because of the confirmed exploited CVE in this rollup.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5073696
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5073696
- Released
- 2026-01-13
- Last changed
- 2026-08-12
- Changes tracked
- 2
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 KB5073696 is installed
Elevated PowerShell. No output means it is not installed.
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 · exploitedKB5073722
54 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.