CVE-2026-26128

7.8

HIGH CVSS 3.1

Windows SMB Server Elevation of Privilege Vulnerability

Overview

Description

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

Details

INFO

Published Date :

March 10, 2026, 6:18 p.m.

Last Modified :

June 17, 2026, 10:25 a.m.

Remotely Exploit :

No

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-26128 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_10
2	Microsoft	windows_server_2012
3	Microsoft	windows_server_2016
4	Microsoft	windows_server_2019
5	Microsoft	windows_10_1607
6	Microsoft	windows_10_1809
7	Microsoft	windows_10_21h2
8	Microsoft	windows_10_22h2
9	Microsoft	windows_server_2022
10	Microsoft	windows_11
11	Microsoft	windows_11_23h2
12	Microsoft	windows_server_2022_23h2
13	Microsoft	windows_server_23h2
14	Microsoft	windows_server_2012_r2
15	Microsoft	windows_11_24h2
16	Microsoft	windows_server_2025
17	Microsoft	windows_11_25h2
18	Microsoft	windows_11_26h1

: Total Affected Vendor : 1 | Products : 18

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS					134c704f-9b21-4f2e-91b3-4a467353bcc0
	CVSS 3.1	HIGH				[email protected]

Solution

Remediate improper authentication in Windows SMB Server to prevent privilege escalation.

Apply vendor patches for Windows SMB Server.
Review and enforce strong authentication policies.
Limit local administrative privileges.

Public PoC/Exploit Available at Github

CVE-2026-26128 has a 5 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-26128.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128	Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server
https://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-26128 is associated with the following CWEs:

CWE-287: Improper Authentication

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-26128 weaknesses.

CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-57: Utilizing REST's Trust in the System Resource to Obtain Sensitive Data Utilizing REST's Trust in the System Resource to Obtain Sensitive Data CAPEC-94: Adversary in the Middle (AiTM) Adversary in the Middle (AiTM) CAPEC-114: Authentication Abuse Authentication Abuse CAPEC-115: Authentication Bypass Authentication Bypass CAPEC-151: Identity Spoofing Identity Spoofing CAPEC-194: Fake the Source of Data Fake the Source of Data CAPEC-593: Session Hijacking Session Hijacking CAPEC-633: Token Impersonation Token Impersonation CAPEC-650: Upload a Web Shell to a Web Server Upload a Web Shell to a Web Server

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

turtletechmw/oscp-learn

None

Python C Shell PHP PowerShell ASP.NET

Updated: 1 month, 1 week ago

0 stars 0 fork 0 watcher

Born at : June 11, 2026, 3:01 p.m. This repo has been linked 85 different CVEs too.

XZ1r0/cve-2026-poc-collection

CVE-2026 PoC Collection - 128 PoCs covering 84 CVEs

Python Dockerfile Shell Java C Makefile Objective-C Rust C++ Go

Updated: 2 months ago

0 stars 0 fork 0 watcher

Born at : May 21, 2026, 3:15 p.m. This repo has been linked 8 different CVEs too.

jarnovandenbrink/CVE-2026-26128

PoC for exploiting CVE-2026-26128.

Python

Updated: 2 months, 2 weeks ago

13 stars 0 fork 0 watcher

Born at : May 5, 2026, 8:27 p.m. This repo has been linked 1 different CVEs too.

killvxk/gitweekly

收集各种有趣的github项目

C C++ PowerShell Python Shell

Updated: 6 days, 4 hours ago

99 stars 21 fork 21 watcher

Born at : July 22, 2025, 4:39 p.m. This repo has been linked 20 different CVEs too.

0xsyr0/OSCP

OSCP Cheat Sheet

oscp oscp-guide cheat-sheet cheatsheet offensive offensive-security offsec penetration-testing pentesting security oscp-plus

Python Shell C PHP PowerShell ASP.NET

Updated: 5 days, 20 hours ago

3784 stars 761 fork 761 watcher

Born at : Oct. 22, 2021, 9:36 a.m. This repo has been linked 87 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-26128 vulnerability anywhere in the article.

The Cyber Express

Microsoft Patch Tuesday March 2026: Two Zero-Days and Critical RCE Bugs Fixed

The Microsoft Patch Tuesday March 2026 release introduces security updates addressing 79 vulnerabilities, including two publicly disclosed zero-day vulnerabilities and several high-risk issues tied to ...

Published Date: Mar 11, 2026 (4 months, 2 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-26128 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

CVE Modified by [email protected]

Jun. 17, 2026

Action	Type	Old Value	New Value
Added	Affected		[{'vendor': 'Microsoft', 'product': 'Windows 10 Version 1607', 'versions': [{'status': 'affected', 'version': '10.0.14393.0', 'lessThan': '10.0.14393.8957', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 10 Version 1809', 'versions': [{'status': 'affected', 'version': '10.0.17763.0', 'lessThan': '10.0.17763.8511', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 10 Version 21H2', 'versions': [{'status': 'affected', 'version': '10.0.19044.0', 'lessThan': '10.0.19044.7058', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 10 Version 22H2', 'versions': [{'status': 'affected', 'version': '10.0.19045.0', 'lessThan': '10.0.19045.7058', 'versionType': 'custom'}], 'platforms': ['32-bit Systems', 'ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 version 22H3', 'versions': [{'status': 'affected', 'version': '10.0.22631.0', 'lessThan': '10.0.22631.6783', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 23H2', 'versions': [{'status': 'affected', 'version': '10.0.22631.0', 'lessThan': '10.0.22631.6783', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 24H2', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.8037', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 Version 25H2', 'versions': [{'status': 'affected', 'version': '10.0.26200.0', 'lessThan': '10.0.26200.8037', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows 11 version 26H1', 'versions': [{'status': 'affected', 'version': '10.0.28000.0', 'lessThan': '10.0.28000.1719', 'versionType': 'custom'}], 'platforms': ['ARM64-based Systems', 'x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2012', 'versions': [{'status': 'affected', 'version': '6.2.9200.0', 'lessThan': '6.2.9200.25973', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2012 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '6.2.9200.0', 'lessThan': '6.2.9200.25973', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2012 R2', 'versions': [{'status': 'affected', 'version': '6.3.9600.0', 'lessThan': '6.3.9600.23074', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2012 R2 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '6.3.9600.0', 'lessThan': '6.3.9600.23074', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2016', 'versions': [{'status': 'affected', 'version': '10.0.14393.0', 'lessThan': '10.0.14393.8957', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2016 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '10.0.14393.0', 'lessThan': '10.0.14393.8957', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2019', 'versions': [{'status': 'affected', 'version': '10.0.17763.0', 'lessThan': '10.0.17763.8511', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2019 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '10.0.17763.0', 'lessThan': '10.0.17763.8511', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2022', 'versions': [{'status': 'affected', 'version': '10.0.20348.0', 'lessThan': '10.0.20348.4893', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2022, 23H2 Edition (Server Core installation)', 'versions': [{'status': 'affected', 'version': '10.0.25398.0', 'lessThan': '10.0.25398.2207', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2025', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.32522', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}, {'vendor': 'Microsoft', 'product': 'Windows Server 2025 (Server Core installation)', 'versions': [{'status': 'affected', 'version': '10.0.26100.0', 'lessThan': '10.0.26100.32522', 'versionType': 'custom'}], 'platforms': ['x64-based Systems']}]

CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Jun. 17, 2026

Action	Type	Old Value	New Value
Added	SSVC		{'id': 'CVE-2026-26128', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-03-05T00:00:00+00:00'}

CVE Modified by af854a3a-2127-422b-91ae-364da2661108

May. 26, 2026

Action	Type	Old Value	New Value
Added	Reference		https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server
Added	Reference		https://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server

Initial Analysis by [email protected]

Mar. 24, 2026

Action	Type	Old Value	New Value
Added	CPE Configuration		OR cpe:2.3:o:microsoft:windows_server_2012:r2::::::: cpe:2.3:o:microsoft:windows_server_2012:-::::::: cpe:2.3:o:microsoft:windows_10_1809:::::::x64: versions up to (excluding) 10.0.17763.8511 cpe:2.3:o:microsoft:windows_10_1809:::::::x86: versions up to (excluding) 10.0.17763.8511 cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64: versions up to (excluding) 10.0.19044.7058 cpe:2.3:o:microsoft:windows_10_21h2:::::::x64: versions up to (excluding) 10.0.19044.7058 cpe:2.3:o:microsoft:windows_10_21h2:::::::x86: versions up to (excluding) 10.0.19044.7058 cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64: versions up to (excluding) 10.0.19045.7058 cpe:2.3:o:microsoft:windows_10_22h2:::::::x64: versions up to (excluding) 10.0.19045.7058 cpe:2.3:o:microsoft:windows_10_22h2:::::::x86: versions up to (excluding) 10.0.19045.7058 cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64: versions up to (excluding) 10.0.22631.6783 cpe:2.3:o:microsoft:windows_11_23h2:::::::x64: versions up to (excluding) 10.0.22631.6783 cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64: versions up to (excluding) 10.0.26100.7979 cpe:2.3:o:microsoft:windows_11_24h2:::::::x64: versions up to (excluding) 10.0.26100.7979 cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64: versions up to (excluding) 10.0.26200.7979 cpe:2.3:o:microsoft:windows_11_25h2:::::::x64: versions up to (excluding) 10.0.26200.7979 cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64: versions up to (excluding) 10.0.28000.1719 cpe:2.3:o:microsoft:windows_11_26h1:::::::x64: versions up to (excluding) 10.0.28000.1719 cpe:2.3:o:microsoft:windows_server_2016::::::::* versions up to (excluding) 10.0.14393.8957 cpe:2.3:o:microsoft:windows_server_2019::::::::* versions up to (excluding) 10.0.17763.8511 cpe:2.3:o:microsoft:windows_server_2022::::::::* versions up to (excluding) 10.0.20348.4830 cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::* versions up to (excluding) 10.0.25398.2207 cpe:2.3:o:microsoft:windows_10_1607:::::::x64: versions up to (excluding) 10.0.14393.8957 cpe:2.3:o:microsoft:windows_10_1607:::::::x86: versions up to (excluding) 10.0.14393.8957 cpe:2.3:o:microsoft:windows_server_2025:::::::x64: versions up to (excluding) 10.0.26100.32463
Added	Reference Type		Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128 Types: Vendor Advisory

New CVE Received by [email protected]

Mar. 10, 2026

Action	Type	New Value
Added	Description	Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
Added	CVSS V3.1	AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Added	CWE	CWE-287
Added	Reference	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.