CVE-2026-26128

high

Description

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

References

https://github.com/HORKimhab/poc-cve-collection

https://github.com/jonaslejon/ad-autopwn

https://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server

https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128

Details

Source: Mitre, NVD

Published: 2026-03-10

Updated: 2026-05-26

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

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

Severity: High

EPSS

EPSS: 0.0004