Medium 6.7Published May 12, 2026

CVE-2026-21530Windows Rich Text Edit Elevation of Privilege Vulnerability

Updated under an hour ago (Oct 28, 2026, 6:10 AM ET)

Does this affect you?

It affects Microsoft 365 Apps for Enterprise and 19 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Microsoft 365 Apps for Enterprise

Exploited in the last 30 days

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

CVSS: 6.7 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Weakness (CWE): CWE-415
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: microsoft
NVD analysis: Analyzed
Record last updated: Aug 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name)	from 16.0.1 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office 2016 microsoft:office_2016 (from the name)	from 16.0.0 before 16.0.5556.1000	CNA record
Microsoft Microsoft Office 2019 microsoft:office_2019 (from the name)	from 19.0.0 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name)	from 16.0.1 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Microsoft Office LTSC 2024 microsoft:office_ltsc_2024 (from the name)	from 16.0.0 before https://aka.ms/OfficeSecurityReleases	CNA record
Microsoft Windows 10 Version 1607 microsoft:windows_10_1607	from 10.0.14393.0 before 10.0.14393.9140	CNA record
Microsoft Windows 10 Version 1809 microsoft:windows_10_1809	from 10.0.17763.0 before 10.0.17763.8755	CNA record
Microsoft Windows 10 Version 21H2 microsoft:windows_10_21h2	from 10.0.19044.0 before 10.0.19044.7291	CNA record
Microsoft Windows 10 Version 22H2 microsoft:windows_10_22h2	from 10.0.19045.0 before 10.0.19045.7417	CNA record
Microsoft Windows 11 version 23H2 microsoft:windows_11_23h2	from 10.0.22631.0 before 10.0.22631.7079	CNA record
1–10 of 34

References

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21530	vendor-advisory, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.