Microsoft released patches for a record-breaking 973 vulnerabilities in its September 2026 Patch Tuesday, including 113 rated critical. It is the largest Patch Tuesday to date, ahead of the previous high of 664 set in July 2026.

Two vulnerabilities are listed as exploited in the wild, while none were publicly disclosed before Patch Tuesday. Notable fixes include Windows privilege escalation and critical remote code execution flaws in Skype for Business, MSMQ and RRAS.