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CVE record · CVE-2026-85880

Windows Advanced Local Procedure Call (ALPC) Elevation of Privilege Vulnerability

CVSS 7.8 HighCriticalIn CISA KEVEPSS 0.0039 · 33rd percentile

Critical, because:

  • In CISA’s KEV catalogue since 8 Sept 2026: it is known to be exploited.

How we decide what’s critical

Published by the CVE Program (CNA: microsoft) at 8 Sept 2026, 17:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Microsoft Windows 10 Version 1607
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows 10 Version 1809
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows 10 Version 21H2
  • affected 10.0.19044.0 to before 10.0.19044.7725 custom
Microsoft Windows 10 Version 22H2
  • affected 10.0.19045.0 to before 10.0.19045.7725 custom
Microsoft Windows Server 2012
  • affected 6.2.9200.0 to before 6.2.9200.26349 custom
Microsoft Windows Server 2012 (Server Core installation)
  • affected 6.2.9200.0 to before 6.2.9200.26349 custom
Microsoft Windows Server 2012 R2
  • affected 6.3.9600.0 to before 6.3.9600.23398 custom
Microsoft Windows Server 2012 R2 (Server Core installation)
  • affected 6.3.9600.0 to before 6.3.9600.23398 custom
Microsoft Windows Server 2016
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2016 (Server Core installation)
  • affected 10.0.14393.0 to before 10.0.14393.9512 custom
Microsoft Windows Server 2019
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2019 (Server Core installation)
  • affected 10.0.17763.0 to before 10.0.17763.9245 custom
Microsoft Windows Server 2022
  • affected 10.0.20348.0 to before 10.0.20348.5622 custom
Identifiers
CVE-2026-85880
CNA
microsoft
Weakness (CWE)
CWE-122 · CWE-908
Tags
Published
8 Sept 2026
Updated
10 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Microsoft Windows 10 (versions 1607, 1809, 21H2 and 22H2), Windows Server 2012, Windows Server 2012 R2 and Windows Server 2016 are affected by a heap-based buffer overflow in Advanced Local Procedure Call (ALPC). An authorized local attacker can exploit it to elevate privileges. Upgrade to the fixed builds listed for each version, such as 10.0.19045.7725 for Windows 10 22H2 or 6.3.9600.23398 for Windows Server 2012 R2.

Written 11 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.8 High 3.1 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 CNA (microsoft)
  • CISA KEV Listed since 8 Sept 2026: known to be exploited.
  • EPSS 0.0039, the 33rd percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 8 Sept 2026, 17:14 UTC Confirmed by the CVE List
  2. 31 Oct 2026, 16:21 UTC First seen by agentprime

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.