High [CVE-2026-81963] Windows Update Stack Elevation of Privilege Vulnerability

CISA Known Exploited Vulnerability

Listed:

Sep 8, 2026 · federal remediation due Sep 22, 2026

Required action:

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Ransomware use:

Unknown

KEV is a prioritization signal from CISA — remediation detail still comes from the vendor advisory.