Tuesday 8 September 2026

September 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.

← Aug 2026 Oct 2026 →

Superseded

Newer updates replace September 2026.

Microsoft fixed 998 CVEs, 132 critical and 2 exploited; no open known issues found in the current public evidence; out-of-band fixes followed on 14 Sep. See November 2026 Patch Tuesday.

26 of these CVEs were added after 8 Sep 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: 998
Critical: 132
Exploited fixed: 2
In CISA KEV: 2
Open known issues: 0
Out-of-band: 8

Release calendar · October 2027

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

Patch Tuesday

Wed 13 Oct

Thu 14 Oct

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Sat 16 Oct

Sun 17 Oct

Mon 18 Oct

Tue 19 Oct

Wed 20 Oct

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Sat 23 Oct

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Mon 25 Oct

Tue 26 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