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Superseded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 · October 2021
Fri 1 Oct
Sat 2 Oct
Sun 3 Oct
Mon 4 Oct
Tue 5 Oct
Wed 6 Oct
Thu 7 Oct
Fri 8 Oct
Sat 9 Oct
Sun 10 Oct
Mon 11 Oct
Tue 12 Oct
Wed 13 Oct
Thu 14 Oct
Fri 15 Oct
Sat 16 Oct
Sun 17 Oct
Mon 18 Oct
Tue 19 Oct
Wed 20 Oct
Thu 21 Oct
Fri 22 Oct
Sat 23 Oct
Sun 24 Oct
Mon 25 Oct
Wed 27 Oct
Thu 28 Oct
Fri 29 Oct
Sat 30 Oct
Sun 31 Oct
Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions