PT-2026-24331 · Microsoft · Windows

Guillaume André + 1 · Published 2026-03-10 · Updated 2026-05-26 · CVE-2026-26128

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows SMB Server (affected versions not specified)

Description An improper authentication mechanism exists in Windows SMB Server. Successful exploitation could allow an attacker to elevate privileges locally. The issue relates to flaws in the authentication process.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

BDU:2026-02973

CVE-2026-26128

Affected Products

Windows

References · 15

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-26128 · Security Note
• https://msrc.microsoft.com/update-guide/advisory/CVE-2026-26128 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-26128 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-26128 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-02973 · Security Note
• https://vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server · Note
• https://t.me/avleonovcom/1637 · Telegram Post
• https://reddit.com/r/CVEWatch/comments/1t4b01f/top_10_trending_cves_05052026 · Reddit Post
• https://twitter.com/CVEnew/status/2033361130756702714 · Twitter Post
• https://reddit.com/r/CVEWatch/comments/1t3d9oz/top_10_trending_cves_04052026 · Reddit Post
• https://t.me/cveNotify/164731 · Telegram Post
• https://synacktiv.com/en/publications/bypassing-windows-authentication-reflection-mitigations-for-system-shells-part-1 · Note
• https://vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-server · Note
• https://reddit.com/r/CVEWatch/comments/1t58epd/top_10_trending_cves_06052026 · Reddit Post