7

CVE-2026-21253

Mailslot File System Elevation of Privilege Vulnerability

Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Microsoft ≫ Windows 10 1607 HwPlatform x64 Version < 10.0.14393.8868
Microsoft ≫ Windows 10 1607 HwPlatform x86 Version < 10.0.14393.8868
Microsoft ≫ Windows 10 1809 HwPlatform x64 Version < 10.0.17763.8389
Microsoft ≫ Windows 10 1809 HwPlatform x86 Version < 10.0.17763.8389
Microsoft ≫ Windows 10 21h2 HwPlatform arm64 Version < 10.0.19044.6937
Microsoft ≫ Windows 10 21h2 HwPlatform x64 Version < 10.0.19044.6937
Microsoft ≫ Windows 10 21h2 HwPlatform x86 Version < 10.0.19044.6937
Microsoft ≫ Windows 10 22h2 HwPlatform arm64 Version < 10.0.19045.6937
Microsoft ≫ Windows 10 22h2 HwPlatform x64 Version < 10.0.19045.6937
Microsoft ≫ Windows 10 22h2 HwPlatform x86 Version < 10.0.19045.6937
Microsoft ≫ Windows 11 23h2 HwPlatform arm64 Version < 10.0.22631.6649
Microsoft ≫ Windows 11 23h2 HwPlatform x64 Version < 10.0.22631.6649
Microsoft ≫ Windows 11 24h2 HwPlatform arm64 Version < 10.0.26100.7781
Microsoft ≫ Windows 11 24h2 HwPlatform x64 Version < 10.0.26100.7781
Microsoft ≫ Windows 11 25h2 HwPlatform arm64 Version < 10.0.26200.7781
Microsoft ≫ Windows 11 25h2 HwPlatform x64 Version < 10.0.26200.7781
Microsoft ≫ Windows Server 2016 SwEdition - HwPlatform x64 Version < 10.0.14393.8868
Microsoft ≫ Windows Server 2019 SwEdition - HwPlatform x64 Version < 10.0.17763.8389
Microsoft ≫ Windows Server 2022 SwEdition - HwPlatform x64 Version < 10.0.20348.4711
Microsoft ≫ Windows Server 2022 23h2 SwEdition - HwPlatform x64 Version < 10.0.25398.2149
Microsoft ≫ Windows Server 2025 HwPlatform x64 Version < 10.0.26100.32313
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.77% 0.507
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Microsoft 7 1 5.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21253
Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-21253-detection-script-elevation-of-privilege-vulnerability-in-mailslot-file-system
https://www.vicarius.io/vsociety/posts/cve-2026-21253-mitigation-script-elevation-of-privilege-vulnerability-in-mailslot-file-system