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CVE-2026-85880· NVD / CVE Program· CNA microsoft

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

Heap-based buffer overflow in Windows ALPC allows an authorized attacker to elevate privileges locally.

HighCVSS 7.8 · v3.1KEVWeaponized Fix available
Published
Sep 8, 2026
Updated
Sep 29, 2026
EPSS
3.6% · 89th percentile
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Action score

62

This week

Don’t wait for the next maintenance window.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 3.6%

CISA SSVC decision

Exploitation
active
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · microsoft
7.8
NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Sep 8, 2026. That signals real attacks, not theory.

Remediation deadline for government agencies: Sep 22, 2026.

Affected systems

VendorProduct
microsoftwindows 10 1607
microsoftwindows 10 1809
microsoftwindows 10 21h2
microsoftwindows 10 22h2
microsoftwindows server 2012
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2012all versions
  • microsoft windows server 2012r2
  • microsoft windows server 2016before 10.0.14393.9512
  • microsoft windows server 2019before 10.0.17763.9245
  • microsoft windows server 2022before 10.0.20348.5622

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 1607

    • 10.0.14393.0 and later · before 10.0.14393.9512affected

  • Microsoft Windows 10 Version 1809

    • 10.0.17763.0 and later · before 10.0.17763.9245affected

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.7725affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.7725affected

  • Microsoft Windows Server 2012

    • 6.2.9200.0 and later · before 6.2.9200.26349affected

  • Microsoft Windows Server 2012 (Server Core installation)

    • 6.2.9200.0 and later · before 6.2.9200.26349affected

  • Microsoft Windows Server 2012 R2

    • 6.3.9600.0 and later · before 6.3.9600.23398affected

  • Microsoft Windows Server 2012 R2 (Server Core installation)

    • 6.3.9600.0 and later · before 6.3.9600.23398affected

  • Microsoft Windows Server 2016

    • 10.0.14393.0 and later · before 10.0.14393.9512affected

  • Microsoft Windows Server 2016 (Server Core installation)

    • 10.0.14393.0 and later · before 10.0.14393.9512affected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before 10.0.17763.9245affected

  • Microsoft Windows Server 2019 (Server Core installation)

    • 10.0.17763.0 and later · before 10.0.17763.9245affected

Same product

microsoft: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Windows 10 Version 1607 for 32-bit Systems10.0.14393.9512 · KB5123099Microsoft (MSRC)
Windows 10 Version 1607 for x64-based Systems10.0.14393.9512 · KB5123099Microsoft (MSRC)
Windows 10 Version 1809 for 32-bit Systems10.0.17763.9245 · KB5122876Microsoft (MSRC)
Windows 10 Version 1809 for x64-based Systems10.0.17763.9245 · KB5122876Microsoft (MSRC)
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.7725 · KB5122878Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.7725 · KB5122878Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.7725 · KB5122878Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.7725 · KB5122878Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.7725 · KB5122878Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.7725 · KB5122878Microsoft (MSRC)
Windows Server 20126.2.9200.26349 · KB5123065Microsoft (MSRC)
Windows Server 2012 (Server Core installation)6.2.9200.26349 · KB5123065Microsoft (MSRC)
Windows Server 2012 R26.3.9600.23398 · KB5123066Microsoft (MSRC)
Windows Server 2012 R2 (Server Core installation)6.3.9600.23398 · KB5123066Microsoft (MSRC)
Windows Server 201610.0.14393.9512 · KB5123099Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.9512 · KB5123099Microsoft (MSRC)
Windows Server 201910.0.17763.9245 · KB5122876Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.9245 · KB5122876Microsoft (MSRC)
Windows Server 202210.0.20348.5622 · KB5122882Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5622 · KB5122882Microsoft (MSRC)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. CISA KEV-1 d
  2. Published
  3. TodaySep 29, 2026+21 d
EPSS, last 120 days+3% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-695860 days apartMicrosoft Windows PDF Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-695900 days apartWindows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-697150 days apartWindows Direct Show Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-697680 days apartWindows RNDIS Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-697690 days apartWindows HTTP Print Provider Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-698240 days apartMicrosoft Standard XPS Remote Code Execution Vulnerability
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records