---
id: CVE-2026-24294
title: >-
  Improper authentication in Windows SMB Server allows an authorized attacker to
  elevate privileges locally.
summary: >-
  Improper authentication in Windows SMB Server allows an authorized attacker to
  elevate privileges locally.
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.8957
  - windows_10_1809 < 10.0.17763.8511
  - windows_10_21h2 < 10.0.19044.7058
  - windows_10_22h2 < 10.0.19045.7058
  - windows_11_23h2 < 10.0.22631.6783
  - windows_11_24h2 < 10.0.26100.7979
  - windows_11_25h2 < 10.0.26200.7979
  - windows_11_26h1 < 10.0.28000.1719
  - windows_server_2012
  - windows_server_2012 = r2
  - windows_server_2016 < 10.0.14393.8957
  - windows_server_2019 < 10.0.17763.8511
  - windows_server_2022 < 10.0.20348.4830
  - windows_server_2022_23h2 < 10.0.25398.2207
  - windows_server_2025 < 10.0.26100.32463
patched:
  - windows_10_1607 10.0.14393.8957
  - windows_10_1809 10.0.17763.8511
  - windows_10_21h2 10.0.19044.7058
  - windows_10_22h2 10.0.19045.7058
  - windows_11_23h2 10.0.22631.6783
  - windows_11_24h2 10.0.26100.7979
  - windows_11_25h2 10.0.26200.7979
  - windows_11_26h1 10.0.28000.1719
  - windows_server_2016 10.0.14393.8957
  - windows_server_2019 10.0.17763.8511
  - windows_server_2022 10.0.20348.4830
  - windows_server_2022_23h2 10.0.25398.2207
  - windows_server_2025 10.0.26100.32463
published: '2026-03-10'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24294'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-24294'
    label: secure@microsoft.com
  - url: >-
      https://www.vicarius.io/vsociety/posts/cve-2026-24294-detection-script-improper-authentication-vulnerability-in-windows-smb-server
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.vicarius.io/vsociety/posts/cve-2026-24294-mitigation-script-improper-authentication-vulnerability-in-windows-smb-server
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://github.com/0xNDI/CVE-2026-24294'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - exploit-available
epss: 0.04671
epssPercentile: 0.91352
ingestedAt: '2026-07-01T03:50:34.507Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/0xNDI/CVE-2026-24294'
  checkedAt: '2026-09-23T07:13:55.745Z'
exploitAvailable: true
---

## Overview

Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.

## Affected

- `windows_10_1607 < 10.0.14393.8957`
- `windows_10_1809 < 10.0.17763.8511`
- `windows_10_21h2 < 10.0.19044.7058`
- `windows_10_22h2 < 10.0.19045.7058`
- `windows_11_23h2 < 10.0.22631.6783`
- `windows_11_24h2 < 10.0.26100.7979`
- `windows_11_25h2 < 10.0.26200.7979`
- `windows_11_26h1 < 10.0.28000.1719`
- `windows_server_2012`
- `windows_server_2012 = r2`
- `windows_server_2016 < 10.0.14393.8957`
- `windows_server_2019 < 10.0.17763.8511`
- `windows_server_2022 < 10.0.20348.4830`
- `windows_server_2022_23h2 < 10.0.25398.2207`
- `windows_server_2025 < 10.0.26100.32463`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.8957`
- `windows_10_1809 10.0.17763.8511`
- `windows_10_21h2 10.0.19044.7058`
- `windows_10_22h2 10.0.19045.7058`
- `windows_11_23h2 10.0.22631.6783`
- `windows_11_24h2 10.0.26100.7979`
- `windows_11_25h2 10.0.26200.7979`
- `windows_11_26h1 10.0.28000.1719`
- `windows_server_2016 10.0.14393.8957`
- `windows_server_2019 10.0.17763.8511`
- `windows_server_2022 10.0.20348.4830`
- `windows_server_2022_23h2 10.0.25398.2207`
- `windows_server_2025 10.0.26100.32463`