Patch tracker / KB5099535
KB5099535: Windows Server 2016 Security Update (July 2026)
KB5099535 is a Critical security update for Windows Server 2016, released 2026-07-14. It closes 258 CVEs with a maximum CVSS of 9.9. 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-2026-32202, which FIRST.org rates at 71% probability of exploitation in the next 30 days.
Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date. If you are unsure, check the linked source before you act, and tell us when we are wrong so we can fix it.
Update summary
Fixes 258 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.9 (Critical). EPSS exploit probability up to 71%. Among the top 25% of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Windows 10 Version 1607 for 32-bit Systems has shipped since this one: KB5126649 (2026-10-13). 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.
We checked Microsoft's support article for KB5099535 on 2026-11-03 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.
KB5099535 is an unusually large Windows 10 1809 and Server 2019 rollup that fixes 260 CVEs, including a Critical flaw rated CVSS 9.9 and at least one CVE already listed in the CISA Known Exploited Vulnerabilities catalog. Any Server 2019 domain controllers, RDS hosts, or 1809 endpoints in your estate are exposed, and the confirmed exploited CVE means attacks are already happening in the wild even though none are ransomware-linked yet.
Do this: Deploy KB5099535 to Server 2019 and Windows 10 1809 systems now, prioritizing internet-facing and domain controller roles because of the KEV-listed CVE.
AI-generated from public data, 2026-07-25. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5099535
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5099535
- Released
- 2026-07-14
- Last changed
- 2026-10-28
- Changes tracked
- 9
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.
Microsoft revised KB5099535 on 2026-10-28: CVEs fixed 262 to 258.
- 2026-07-29 CVEs fixed 260 to 261
- 2026-10-13 CVEs fixed 261 to 262
- 2026-10-28 CVEs fixed 262 to 258
Recorded by Senserva on the dates shown, from the MSRC release feed. This is what moved and when, which neither the vendor advisory nor NVD publishes.
Check if KB5099535 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
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016
- Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)
- Windows 10 Version 1607 for 32-bit Systems
- Windows 10 Version 1607 for x64-based Systems
- Windows Server 2016
- Windows Server 2016 (Server Core installation)
- Also released in July 2026
KB5099444
182 CVEs · Critical · exploitedKB5099445
171 CVEs · Critical · exploitedKB5099536
383 CVEs · Critical · exploitedKB5099538
308 CVEs · Critical · exploitedKB5099539
310 CVEs · Critical · exploitedKB5099540
322 CVEs · Critical · exploitedKB5101649
377 CVEs · Critical · exploitedKB5101650
374 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.