Patch tracker / KB5089548
KB5089548: Windows Server 2019 Security Update (July 2026)
KB5089548 is a Critical security update for Windows Server 2019, released 2026-07-14. It closes 62 CVEs with a maximum CVSS of 9.8. The most likely of them to be attacked is CVE-2026-48566, which FIRST.org rates at 80% probability of exploitation in the next 30 days.
Update summary
Fixes 62 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 4.7%. 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.
Microsoft documents 1 known issue with this update.
- Microsoft is not currently aware of any issues with this update.
KB5089548 is the July 2026 security update for Windows 11 Version 26H1 on ARM64 hardware, a narrow platform slice that covers Surface Pro X style devices and other ARM laptops rather than mainstream x64 fleets. The per-update CVE detail is still provisional, so treat this as part of a large cycle carrying 622 CVEs and 56 rated Critical across all updates, with no named zero-day mapped to this specific package. ARM64 builds are often patched and tested later than x64, so admins may not have this in their usual ring.
Do this: Confirm your ARM64 Windows 11 26H1 devices are enrolled in patch scanning and stage KB5089548 to a pilot ring now, then revisit the CVE list once Microsoft publishes final detail.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5089548
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5089548
- Released
- 2026-07-14
- Last changed
- 2026-07-14
- 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 KB5089548 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5089548 (checked 2026-08-11). Verify against the article before acting.
Microsoft is not currently aware of any issues with this update.
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 July 2026
KB5099444
185 CVEs · Critical · exploitedKB5099445
174 CVEs · Critical · exploitedKB5099535
261 CVEs · Critical · exploitedKB5099536
389 CVEs · Critical · exploitedKB5099538
312 CVEs · Critical · exploitedKB5099539
314 CVEs · Critical · exploitedKB5099540
326 CVEs · Critical · exploitedKB5101649
383 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.