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.

← Sep 2026 Nov 2026 →

Superseded

Newer updates replace October 2026.

Microsoft fixed 1474 CVEs, 94 critical and 1 exploited; no open known issues found in the current public evidence; 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

Microsoft CVEs: 1474
Critical: 94
Exploited fixed: 1
In CISA KEV: 1
Open known issues: 0
Out-of-band: 8

Release calendar · October 2026

Thu 1 Oct

Fri 2 Oct

Sat 3 Oct

Sun 4 Oct

Mon 5 Oct

Tue 6 Oct

Wed 7 Oct

Microsoft Teams 26261.303.5165.1465

Thu 8 Oct

Fri 9 Oct

Sat 10 Oct

Sun 11 Oct

Mon 12 Oct

Tue 13 Oct

Wed 14 Oct

Thu 15 Oct

Microsoft Teams 2 releases

Fri 16 Oct

Sat 17 Oct

Sun 18 Oct

Mon 19 Oct

Tue 20 Oct

Wed 21 Oct

Microsoft 365 Apps 20527.20088

Thu 22 Oct

Fri 23 Oct

Sat 24 Oct

Sun 25 Oct

Mon 26 Oct

Tue 27 Oct

Wed 28 Oct

Thu 29 Oct

Microsoft Teams 26276.513.5241.9675

Fri 30 Oct

Sat 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