Tuesday 13 October 2026
October 2026: is it safe to deploy?
What Microsoft fixed, how urgent it is, and whether anything broke, per Windows version, from Microsoft's release tables, release health, MSRC, CISA, and what the community reports.
Superseded
Newer updates replace October 2026.
Microsoft fixed 1474 CVEs, 94 critical and 1 exploited; 1 known issue is still open; out-of-band fixes followed on 26 Oct. See November 2026 Patch Tuesday.
59 of these CVEs were added after 13 Oct 2026; the release-day timeline keeps the original publication dates.
ChangeIntel's reading of public signals, not advice; check Microsoft's guidance and test before you deploy. Terms
Release calendar · September 2026
Tue 1 Sep
Wed 2 Sep
Thu 3 Sep
Fri 4 Sep
Sat 5 Sep
Sun 6 Sep
Mon 7 Sep
Tue 8 Sep
- Patch Tuesday
- KB5123099 · Win 10 1607, Server 2016
- KB5122876 · Win 10 1809, Server 2019
+36 more
- KB5122878 · Win 10 21H2, Win 10 22H2
- KB5122880 · Win 11 23H2
- KB5124008 · Win 11 24H2, Win 11 25H2
- KB5124012 · Win 11 26H1
- KB5122882 · Server 2022
- KB5122871 · Server 2025
- KB5126043 · .NET Framework
- KB5126046 · .NET Framework
- KB5126047 · .NET Framework
- KB5126048 · .NET Framework
- KB5126050 · .NET Framework
- KB5126052 · .NET Framework
- KB5126053 · .NET Framework
- KB5126144 · .NET Framework
- KB5126145 · .NET Framework
- KB5126146 · .NET Framework
- KB5126149 · .NET Framework
- KB5126421 · .NET Framework
- KB5126422 · .NET Framework
- KB5126424 · .NET Framework
- KB5120716 · .NET Framework
- KB5120695 · .NET Framework
- KB5126044 · .NET Framework
- KB5126045 · .NET Framework
- KB5126049 · .NET Framework
- KB5126051 · .NET Framework
- Microsoft 365 Apps 4 releases
- Microsoft Teams 26225.1806.5074.1452
- Exchange Server SE 15.2.2562.49
- Exchange Server 2019 2 releases
- Exchange Server 2016 15.1.2507.73
- SharePoint Server Subscription Edition 16.0.20326.20136
- SQL Server 2025 2 releases
- SQL Server 2022 2 releases
- SQL Server 2019 2 releases
- SQL Server 2017 2 releases
Wed 9 Sep
Thu 10 Sep
Fri 11 Sep
Sat 12 Sep
Sun 13 Sep
Mon 14 Sep
Wed 16 Sep
Thu 17 Sep
Fri 18 Sep
Sat 19 Sep
Sun 20 Sep
Mon 21 Sep
Wed 23 Sep
Thu 24 Sep
Fri 25 Sep
Sat 26 Sep
Sun 27 Sep
Mon 28 Sep
Wed 30 Sep
Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions