Patch tracker / KB5099414
KB5099414: Windows 11 Version 23H2 Security Update (July 2026)
KB5099414 is a Critical security update for Windows 11 Version 23H2, released 2026-07-14. It closes 19 CVEs with a maximum CVSS of 9.8. At least one of them is actively exploited (CISA KEV), so this is a deploy-first update. It is the 18th largest of the 61 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 19 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 4.9%. Among the top half of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Windows 11 Version 23H2 for ARM64-based Systems has shipped since this one: KB5126653 (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.
Microsoft documents 1 known issue with this update.
- Microsoft is not currently aware of any issues with this update.
KB5099414 is a Security Update for Windows 11 Version 23H2 on both ARM64 and x64 systems, shipping in the July 2026 Patch Tuesday cycle. The per-update CVE detail is still provisional because Microsoft has not published it for this cycle yet, and the release document maps no named zero-days to this specific update. The surrounding cycle is unusually large at 622 CVEs total including 56 rated Critical, so this update lands amid a heavy overall patch load.
Do this: Deploy KB5099414 to your Windows 11 23H2 ARM64 and x64 fleet through your normal ring process, and recheck MSRC for the per-update CVE breakdown once Microsoft finalizes it.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5099414
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5099414
- Released
- 2026-07-14
- Last changed
- 2026-10-13
- Changes tracked
- 8
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 KB5099414 on 2026-10-13: CVEs fixed 18 to 19.
- 2026-09-15 CVEs fixed 17 to 18
- 2026-10-13 CVEs fixed 18 to 19
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 KB5099414 is installed
Elevated PowerShell. No output means it is not installed.
Known issues, from Microsoft
Quoted from Microsoft's support article for KB5099414 (checked 2026-10-13). 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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-32202 | Medium | 4.3 | 4.9% | KEV |
| CVE-2026-42990 | Critical | 9.8 | 4.9% | No |
| CVE-2026-49172 | Critical | 9.8 | 4.9% | No |
| CVE-2026-42982 | High | 7.8 | 4.9% | No |
| CVE-2026-44800 | High | 7.8 | 4.9% | No |
| CVE-2026-50471 | High | 7.8 | 4.9% | No |
| CVE-2026-58601 | High | 7.8 | 4.9% | No |
| CVE-2026-40378 | High | 7.5 | 4.9% | No |
| CVE-2026-50696 | High | 7.5 | 4.9% | No |
| CVE-2026-58640 | High | 7.3 | 4.9% | No |
| CVE-2026-48571 | High | 7.0 | 4.9% | No |
| CVE-2026-48572 | High | 7.0 | 4.9% | No |
| CVE-2026-56173 | High | 7.0 | 4.9% | No |
| CVE-2026-58629 | High | 7.0 | 4.9% | No |
| CVE-2026-59116 | Medium | 6.8 | 4.9% | No |
| CVE-2026-34348 | Medium | 6.5 | 4.9% | No |
| CVE-2026-33842 | Medium | 5.5 | 4.9% | No |
| CVE-2026-34328 | Medium | 5.5 | 4.9% | No |
| CVE-2026-34346 | Medium | 5.5 | 4.9% | No |
Scope and sources
- Affected products
- Also released in July 2026
KB5099444
186 CVEs · Critical · exploitedKB5099445
175 CVEs · Critical · exploitedKB5099535
262 CVEs · Critical · exploitedKB5099536
390 CVEs · Critical · exploitedKB5099538
313 CVEs · Critical · exploitedKB5099539
315 CVEs · Critical · exploitedKB5099540
327 CVEs · Critical · exploitedKB5101649
384 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.