PT-2026-7357 · Microsoft · Windows Hyper-V+1

Sai Ganesh Ramachandran · Published 2026-02-10 · Updated 2026-03-10 · CVE-2026-21255

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Windows Hyper-V (affected versions not specified)

Description An improper access control issue in Windows Hyper-V can allow a local attacker to bypass a security feature. This bypass could allow an authorized attacker to compromise the system.

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

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

BDU:2026-01807

CVE-2026-21255

Affected Products

Windows

Windows Hyper-V

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-21255 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21255 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-21255 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-21255 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21255 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-01807 · Security Note