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Superseded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 · September 2023
Fri 1 Sep
Sat 2 Sep
Sun 3 Sep
Mon 4 Sep
Tue 5 Sep
Wed 6 Sep
Thu 7 Sep
Fri 8 Sep
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Tue 12 Sep
Wed 13 Sep
Thu 14 Sep
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Mon 18 Sep
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Mon 25 Sep
Wed 27 Sep
Thu 28 Sep
Fri 29 Sep
Sat 30 Sep
Patch Tuesday and security (B) releasesPreview (D) releasesOut-of-band releases.NET Framework servicing packagesEdge, Office, Teams, Defender and server releasesAll product versions