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Superseded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 · March 2029

Thu 1 Mar

Fri 2 Mar

Sat 3 Mar

Sun 4 Mar

Mon 5 Mar

Tue 6 Mar

Wed 7 Mar

Thu 8 Mar

Fri 9 Mar

Sat 10 Mar

Sun 11 Mar

Mon 12 Mar

Tue 13 Mar

Patch Tuesday

Wed 14 Mar

Thu 15 Mar

Fri 16 Mar

Sat 17 Mar

Sun 18 Mar

Mon 19 Mar

Tue 20 Mar

Wed 21 Mar

Thu 22 Mar

Fri 23 Mar

Sat 24 Mar

Sun 25 Mar

Mon 26 Mar

Tue 27 Mar

Wed 28 Mar

Thu 29 Mar

Fri 30 Mar

Sat 31 Mar

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