CVE-2026-26128
HIGH EPSS 35.7%
Published Mar 10, 20263mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
Published Mar 10, 2026 3mo ago
Last Modified Jun 17, 2026 1w ago
Description
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
35.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-287 Improper Authentication Authentication
Affected Products 25
| Vendor | Product | Version | Range |
|---|---|---|---|
| microsoft | windows_10_1607 | * | <10.0.14393.8957 |
| microsoft | windows_10_1607 | * | <10.0.14393.8957 |
| microsoft | windows_10_1809 | * | <10.0.17763.8511 |
| microsoft | windows_10_1809 | * | <10.0.17763.8511 |
| microsoft | windows_10_21h2 | * | <10.0.19044.7058 |
| microsoft | windows_10_21h2 | * | <10.0.19044.7058 |
| microsoft | windows_10_21h2 | * | <10.0.19044.7058 |
| microsoft | windows_10_22h2 | * | <10.0.19045.7058 |
| microsoft | windows_10_22h2 | * | <10.0.19045.7058 |
| microsoft | windows_10_22h2 | * | <10.0.19045.7058 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6783 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6783 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7979 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7979 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7979 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7979 |
| microsoft | windows_11_26h1 | * | <10.0.28000.1719 |
| microsoft | windows_11_26h1 | * | <10.0.28000.1719 |
| microsoft | windows_server_2012 | * | any |
| microsoft | windows_server_2012 | r2 | any |
| microsoft | windows_server_2016 | * | <10.0.14393.8957 |
| microsoft | windows_server_2019 | * | <10.0.17763.8511 |
| microsoft | windows_server_2022 | * | <10.0.20348.4830 |
| microsoft | windows_server_2022_23h2 | * | <10.0.25398.2207 |
| microsoft | windows_server_2025 | * | <10.0.26100.32463 |
References 3
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.