Patch tracker / KB5073698
KB5073698: Windows Server 2019 Security Update (January 2026)
KB5073698 is a High security update for Windows Server 2019, released 2026-01-13. It closes 36 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 36 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.
KB5073698 is the January 13, 2026 rollup for Windows 10 version 1809 and Windows Server 2019, patching 36 CVEs topping out at High severity (CVSS 8.8). One of these flaws is already listed in the CISA Known Exploited Vulnerabilities catalog, meaning attacks have been observed in the wild, though none is currently tied to ransomware campaigns.
Do this: Deploy KB5073698 to your 1809 and Server 2019 fleet now, prioritizing internet-facing Server 2019 hosts given the confirmed CISA KEV listing.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5073698
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5073698
- 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 KB5073698 is installed
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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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-20805 | Medium | 5.5 | 75% | KEV |
| CVE-2026-20936 | Critical | 9.8 | 75% | No |
| CVE-2026-20868 | High | 8.8 | 75% | No |
| CVE-2026-20856 | High | 8.1 | 75% | No |
| CVE-2026-20931 | High | 8.0 | 75% | No |
| CVE-2023-31096 | High | 7.8 | 75% | No |
| CVE-2024-55414 | High | 7.8 | 75% | No |
| CVE-2026-20816 | High | 7.8 | 75% | No |
| CVE-2026-20820 | High | 7.8 | 75% | No |
| CVE-2026-20831 | High | 7.8 | 75% | No |
| CVE-2026-20840 | High | 7.8 | 75% | No |
| CVE-2026-20843 | High | 7.8 | 75% | No |
| CVE-2026-20860 | High | 7.8 | 75% | No |
| CVE-2026-20922 | High | 7.8 | 75% | No |
| CVE-2026-20940 | High | 7.8 | 75% | No |
| CVE-2026-0386 | High | 7.5 | 75% | No |
| CVE-2026-20848 | High | 7.5 | 75% | No |
| CVE-2026-20849 | High | 7.5 | 75% | No |
| CVE-2026-20875 | High | 7.5 | 75% | No |
| CVE-2026-20919 | High | 7.5 | 75% | No |
| CVE-2026-20921 | High | 7.5 | 75% | No |
| CVE-2026-20926 | High | 7.5 | 75% | No |
| CVE-2026-20929 | High | 7.5 | 75% | No |
| CVE-2026-20934 | High | 7.5 | 75% | No |
| CVE-2026-20869 | High | 7.0 | 75% | No |
| CVE-2026-20847 | Medium | 6.5 | 75% | No |
| CVE-2026-20872 | Medium | 6.5 | 75% | No |
| CVE-2026-20925 | Medium | 6.5 | 75% | No |
| CVE-2026-21265 | Medium | 6.4 | 75% | No |
| CVE-2026-20821 | Medium | 6.2 | 75% | No |
| CVE-2026-20824 | Medium | 5.5 | 75% | No |
| CVE-2026-20833 | Medium | 5.5 | 75% | No |
| CVE-2026-20839 | Medium | 5.5 | 75% | No |
| CVE-2026-20927 | Medium | 5.3 | 75% | No |
| CVE-2026-20828 | Medium | 4.6 | 75% | No |
| CVE-2026-20834 | Medium | 4.6 | 75% | No |
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.