High [CVE-2026-85880] Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability
This high-severity Microsoft Server advisory covers CVE-2026-85880 affecting Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation).
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Summary
Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.
Affected products named by the advisory: Windows Server 2012; Windows Server 2012 (Server Core installation); Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); and 5 more.
Affected products named by the advisory: Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); Windows Server 2022.
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.
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9512
- Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9245
- Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7725
- Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7725
- Windows Server 2012 6.2.9200.0 before 6.2.9200.26349
- Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26349
- Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23397
- Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.23397
- Windows Server 2016 10.0.14393.0 before 10.0.14393.9512
- Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.9512
- Windows Server 2019 10.0.17763.0 before 10.0.17763.9245
- Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.9245
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 10.0.14393.9512
- 10.0.17763.9245
- 10.0.19044.7725
- 10.0.19045.7725
- 6.2.9200.26349
- 6.3.9600.23397
- 10.0.20348.5622
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 10.0.14393.9512, 10.0.17763.9245, 10.0.19044.7725, 10.0.19045.7725, 6.2.9200.26349, 6.3.9600.23397. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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