# CVE-2026-81963

## Summary

- **CVE ID:** CVE-2026-81963
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C)
- **CWE:** CWE-59, CWE-284
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 10, 2026

## Description

Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.

## Affected Products

- Microsoft — Windows 11 version 23H2 (10.0.22631.0)
- Microsoft — Windows 11 Version 23H2 (10.0.22631.0)
- Microsoft — Windows 11 Version 24H2 (10.0.26100.0)
- Microsoft — Windows 11 Version 25H2 (10.0.26200.0)
- Microsoft — Windows 11 version 26H1 (10.0.28000.0)
- Microsoft — Windows Server 2025 (10.0.26100.0)
- Microsoft — Windows Server 2025 (Server Core installation) (10.0.26100.0)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-81963)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-81963)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.63%
- **EPSS Percentile:** 48.2

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Sep 8, 2026
- **Due Date:** Sep 22, 2026

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._