CVE-2026-81963
HIGHCVSS 3.1 · 7.8 · secure@microsoft.com
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
CISA KEV: known exploited
Added: 2026-09-08 · Due: 2026-09-22
Known ransomware use: Unknown
EPSS: 0.39% · Percentile: 33.4%
As of 2026-10-27
EPSS estimates exploitation probability over the next 30 days. KEV due dates apply to US federal civilian agencies. Confirm your affected versions in vendor advisories.
CWE: CWE-59, CWE-284 · Published: 2026-09-08T18:21:00.090 · Modified: 2026-09-09T05:18:17.173
Sources: NIST NVD, CISA KEV, FIRST EPSS. NVD and EPSS cached up to 6 hours; KEV up to 12 hours.