KB5122878: Windows 10 version 21H2 / Windows 10 Version 22H2 Security Update (September 2026)

critical Nessus Plugin ID 343867

Version 1.5

Sep 16, 2026, 12:20 AM

  • CISA reference
  • CVSS metrics ("CVSSv2 score" set to 6.8)
  • CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C")
  • CVSSv2 score source (changed from "CVE-2026-69431" to "CVE-2026-77503")
  • CVSSv2 severity (based on CVE-2026-77503, severity decreased from "High" to "Medium")
  • CVSSv3 score source (changed from "CVE-2026-77503" to none)

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