Patch tracker / KB5075999
KB5075999: Windows Server 2019 Security Update (February 2026)
KB5075999 is a High security update for Windows Server 2019, released 2026-02-10. It closes 21 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-2026-21519, which FIRST.org rates at 26% probability of exploitation in the next 30 days.
Update summary
Fixes 21 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 26%. 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.
KB5075999 is the February 10, 2026 rollup for Windows 10 version 1809 and Windows Server 2019, patching 21 CVEs topped by a High severity flaw at CVSS 8.8. One of these CVEs is on the CISA KEV list, meaning it is confirmed exploited in the wild, though none are currently tied to ransomware. With a peak EPSS of 26 percent, the exploited KEV entry is the reason to prioritize this over a routine monthly patch.
Do this: Deploy KB5075999 to your 1809 and Server 2019 fleet now, prioritizing internet-facing hosts because of the confirmed KEV-listed CVE.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5075999
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5075999
- Released
- 2026-02-10
- Last changed
- 2026-02-10
- Changes tracked
- 1
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 KB5075999 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-2026-21510 | High | 8.8 | 26% | KEV |
| CVE-2026-21513 | High | 8.8 | 26% | KEV |
| CVE-2026-21519 | High | 7.8 | 26% | KEV |
| CVE-2026-21533 | High | 7.8 | 26% | KEV |
| CVE-2026-21525 | Medium | 6.2 | 26% | KEV |
| CVE-2026-21249 | High | 8.8 | 26% | No |
| CVE-2026-21255 | High | 8.8 | 26% | No |
| CVE-2026-21231 | High | 7.8 | 26% | No |
| CVE-2026-21236 | High | 7.8 | 26% | No |
| CVE-2026-21238 | High | 7.8 | 26% | No |
| CVE-2026-21239 | High | 7.8 | 26% | No |
| CVE-2026-21246 | High | 7.8 | 26% | No |
| CVE-2026-21251 | High | 7.8 | 26% | No |
| CVE-2026-20846 | High | 7.5 | 26% | No |
| CVE-2026-21235 | High | 7.3 | 26% | No |
| CVE-2026-21244 | High | 7.3 | 26% | No |
| CVE-2026-21247 | High | 7.3 | 26% | No |
| CVE-2026-21248 | High | 7.3 | 26% | No |
| CVE-2026-21253 | High | 7.0 | 26% | No |
| CVE-2026-21508 | High | 7.0 | 26% | No |
| CVE-2026-21222 | Medium | 5.5 | 26% | No |
Scope and sources
- Affected products
- Also released in February 2026
KB5075897
29 CVEs · High · exploitedKB5075899
29 CVEs · High · exploitedKB5075904
24 CVEs · High · exploitedKB5075906
27 CVEs · High · exploitedKB5075912
24 CVEs · High · exploitedKB5075941
26 CVEs · High · exploitedKB5075942
29 CVEs · High · exploitedKB5075943
27 CVEs · High · 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.