Patch tracker / KB5126653
KB5126653: Windows 11 Version 23H2 Security Update (October 2026)
KB5126653 is a Critical security update for Windows 11 Version 23H2, released 2026-10-13. It closes 965 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. The most likely of them to be attacked is CVE-2026-96951, which FIRST.org rates at 10% 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Our data comes from Microsoft, CISA and other public sources, and it can be wrong or out of date.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 965 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 9.8%. Among the top half of tracked Microsoft updates by EPSS exploit probability.
We checked Microsoft's support article for KB5126653 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.
Senserva AI Opinion and rich prompt for KB5126653
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5126653
- Released
- 2026-10-13
- Last changed
- 2026-10-25
- Changes tracked
- 5
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 KB5126653 on 2026-10-15: CVEs fixed 964 to 965.
- 2026-10-15 CVEs fixed 964 to 965
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 KB5126653 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.
Scope and sources
- Affected products
- Also released in October 2026
KB5126646
1041 CVEs · Critical · exploitedKB5126651
918 CVEs · Critical · exploitedKB5126655
977 CVEs · Critical · exploitedKB5126657
899 CVEs · Critical · exploitedKB5126836
649 CVEs · Critical · exploitedKB5126868
769 CVEs · Critical · exploitedKB5127646
997 CVEs · Critical · exploitedKB5127648
1009 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.