CVE-2026-81963

HIGHCVSS 7.8Known Exploited

CISA Known Exploited Vulnerability

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-81963 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-81963

Remediation deadline: September 22, 2026

Description

Microsoft Windows Update Stack contains a link following vulnerability that allows a local attacker to escalate privileges locally up to SYSTEM.

Timeline

Published:September 8th, 2026 6:21 PM

Last modified:September 9th, 2026 5:18 AM

Added to KEV:September 8th, 2026

CVSS Scoring

CVSS v3: 7.8 (HIGH)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

From NVD CPE configuration data

Vendors

microsoft

Products

windows_11_23h2windows_11_24h2windows_11_25h2windows_11_26h1windows_server_2025

Weaknesses (CWE)

CWE-59 CWE-284

References & Reports

Advisories, patches, and third-party reports

Source: NIST NVD · Data may lag official sources by up to one minute