CVE-2026-21255
HIGH EPSS 27.5%
Published Feb 10, 20264mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
Published Feb 10, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago
Description
Improper access control in Windows Hyper-V allows an authorized attacker to bypass a security feature locally.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
27.5% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-284
Affected Products 15
| Vendor | Product | Version | Range |
|---|---|---|---|
| microsoft | windows_10_1607 | * | <10.0.14393.8868 |
| microsoft | windows_10_1809 | * | <10.0.17763.8389 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_server_2016 | * | <10.0.14393.8868 |
| microsoft | windows_server_2019 | * | <10.0.17763.8389 |
| microsoft | windows_server_2022 | * | <10.0.20348.4711 |
| microsoft | windows_server_2022_23h2 | * | <10.0.25398.2149 |
| microsoft | windows_server_2025 | * | <10.0.26100.32313 |
References 1
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21255
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.