CVE-2026-26128
Received
Received - Intake
Improper Authentication in Windows SMB Server Enables Local Privilege Escalation
Publication date: 2026-03-10
Last updated on: 2026-03-24
Assigner: Microsoft Corporation
Description
Description
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2012 | r2 |
| microsoft | windows_server_2012 | * |
| microsoft | windows_10_1809 | to 10.0.17763.8511 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.8511 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7058 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7058 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7058 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7058 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7058 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7058 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.6783 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.6783 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.7979 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.7979 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.7979 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.7979 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.1719 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.1719 (exc) |
| microsoft | windows_server_2016 | to 10.0.14393.8957 (exc) |
| microsoft | windows_server_2019 | to 10.0.17763.8511 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.4830 (exc) |
| microsoft | windows_server_2022_23h2 | to 10.0.25398.2207 (exc) |
| microsoft | windows_10_1607 | to 10.0.14393.8957 (exc) |
| microsoft | windows_10_1607 | to 10.0.14393.8957 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.32463 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-287 | When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is an improper authentication issue in the Windows SMB Server. It allows an authorized attacker to elevate their privileges locally on the affected system.
What immediate steps should I take to mitigate this vulnerability?
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
How can this vulnerability impact me? :
The impact of this vulnerability is that an attacker who already has some level of access can increase their privileges on the system. This means they could gain higher-level permissions, potentially leading to full control over the affected Windows SMB Server.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
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