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.
Superseded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
Release calendar · May 2025
Thu 1 May
Fri 2 May
Sat 3 May
Sun 4 May
Mon 5 May
Tue 6 May
Wed 7 May
Thu 8 May
Fri 9 May
Sat 10 May
Sun 11 May
Mon 12 May
Tue 13 May
Wed 14 May
Thu 15 May
Fri 16 May
Sat 17 May
Sun 18 May
Mon 19 May
Tue 20 May
Wed 21 May
Thu 22 May
Fri 23 May
Sat 24 May
Sun 25 May
Mon 26 May
Tue 27 May
Thu 29 May
Fri 30 May
Sat 31 May
Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions