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Superseded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 · November 2029

Thu 1 Nov

Fri 2 Nov

Sat 3 Nov

Sun 4 Nov

Mon 5 Nov

Tue 6 Nov

Wed 7 Nov

Thu 8 Nov

Fri 9 Nov

Sat 10 Nov

Sun 11 Nov

Mon 12 Nov

Tue 13 Nov

Patch Tuesday

Wed 14 Nov

Thu 15 Nov

Fri 16 Nov

Sat 17 Nov

Sun 18 Nov

Mon 19 Nov

Tue 20 Nov

Wed 21 Nov

Thu 22 Nov

Fri 23 Nov

Sat 24 Nov

Sun 25 Nov

Mon 26 Nov

Tue 27 Nov

Wed 28 Nov

Thu 29 Nov

Fri 30 Nov

Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions