CVE-2026-21530

MediumCVSS 6.7/10Last modified Nov 11, 2026

Description

Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1 6.7/10CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-415

Affected software

VendorProductVersions
MicrosoftMicrosoft 365 Apps for Enterprise>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office 2016>= 16.0.0, < 16.0.5556.1000
MicrosoftMicrosoft Office 2019>= 19.0.0, < https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office LTSC 2021>= 16.0.1, < https://aka.ms/OfficeSecurityReleases
MicrosoftMicrosoft Office LTSC 2024>= 16.0.0, < https://aka.ms/OfficeSecurityReleases
MicrosoftWindows 10 Version 1607>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows 10 Version 1809>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows 10 Version 21H2>= 10.0.19044.0, < 10.0.19044.7291
MicrosoftWindows 10 Version 22H2>= 10.0.19045.0, < 10.0.19045.7417
MicrosoftWindows 11 version 23H2>= 10.0.22631.0, < 10.0.22631.7079
MicrosoftWindows 11 Version 23H2>= 10.0.22631.0, < 10.0.22631.7219
MicrosoftWindows 11 Version 24H2>= 10.0.26100.0, < 10.0.26100.8457
MicrosoftWindows 11 Version 25H2>= 10.0.26200.0, < 10.0.26200.8457
MicrosoftWindows 11 version 26H1>= 10.0.28000.0, < 10.0.28000.2113
MicrosoftWindows Server 2012>= 6.2.9200.0, < 6.2.9200.26079
MicrosoftWindows Server 2012 (Server Core installation)>= 6.2.9200.0, < 6.2.9200.26079
MicrosoftWindows Server 2012 R2>= 6.3.9600.0, < 6.3.9600.23181
MicrosoftWindows Server 2012 R2 (Server Core installation)>= 6.3.9600.0, < 6.3.9600.23181
MicrosoftWindows Server 2016>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows Server 2016 (Server Core installation)>= 10.0.14393.0, < 10.0.14393.9140
MicrosoftWindows Server 2019>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows Server 2019 (Server Core installation)>= 10.0.17763.0, < 10.0.17763.8755
MicrosoftWindows Server 2022>= 10.0.20348.0, < 10.0.20348.5139
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)>= 10.0.25398.0, < 10.0.25398.2330
MicrosoftWindows Server 2025>= 10.0.26100.0, < 10.0.26100.32860
MicrosoftWindows Server 2025 (Server Core installation)>= 10.0.26100.0, < 10.0.26100.32860

References

Timeline

Published
May 12, 2026
Last modified
Nov 11, 2026
NVD status
Analyzed

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CVE-2026-21530: Medium severity, CVSS 6.7 | Vulnix