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TI-2026-17383 Aliases CVE-2026-21530GHSA-xp4f-mw6j-jxm8

Windows Rich Text Edit Elevation of Privilege Vulnerability

Priority LOW 32CWE-415Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
Required
Attack complexity
High
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00319 25th percentileScored 2026-11-07
Fix Fixed Microsoft: 17 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft 365 Apps for Enterprise16.0.1 to before https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleasesPatch availableCNA
MicrosoftMicrosoft Office 201616.0.0 to before 16.0.5556.100016.0.5556.1000Patch availableCNA
MicrosoftMicrosoft Office 201919.0.0 to before https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleasesPatch availableCNA
MicrosoftMicrosoft Office LTSC 202116.0.1 to before https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleasesPatch availableCNA
MicrosoftMicrosoft Office LTSC 202416.0.0 to before https://aka.ms/OfficeSecurityReleaseshttps://aka.ms/OfficeSecurityReleasesPatch availableCNA
MicrosoftWindows 10 Version 160710.0.14393.0 to before 10.0.14393.914010.0.14393.9140Patch availableCNA
MicrosoftWindows 10 Version 180910.0.17763.0 to before 10.0.17763.875510.0.17763.8755Patch availableCNA
MicrosoftWindows 10 Version 21H210.0.19044.0 to before 10.0.19044.729110.0.19044.7291Patch availableCNA
MicrosoftWindows 10 Version 22H210.0.19045.0 to before 10.0.19045.741710.0.19045.7417Patch availableCNA
MicrosoftWindows 11 version 23H210.0.22631.0 to before 10.0.22631.707910.0.22631.7079Patch availableCNA
MicrosoftWindows 11 Version 23H210.0.22631.0 to before 10.0.22631.721910.0.22631.7219Patch availableCNA
MicrosoftWindows 11 Version 24H210.0.26100.0 to before 10.0.26100.845710.0.26100.8457Patch availableCNA
MicrosoftWindows 11 Version 25H210.0.26200.0 to before 10.0.26200.845710.0.26200.8457Patch availableCNA
MicrosoftWindows 11 version 26H110.0.28000.0 to before 10.0.28000.211310.0.28000.2113Patch availableCNA
MicrosoftWindows Server 20126.2.9200.0 to before 6.2.9200.260796.2.9200.26079Patch availableCNA
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 to before 6.2.9200.260796.2.9200.26079Patch availableCNA
MicrosoftWindows Server 2012 R26.3.9600.0 to before 6.3.9600.231816.3.9600.23181Patch availableCNA
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 to before 6.3.9600.231816.3.9600.23181Patch availableCNA
MicrosoftWindows Server 201610.0.14393.0 to before 10.0.14393.914010.0.14393.9140Patch availableCNA
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 to before 10.0.14393.914010.0.14393.9140Patch availableCNA
MicrosoftWindows Server 201910.0.17763.0 to before 10.0.17763.875510.0.17763.8755Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 to before 10.0.17763.875510.0.17763.8755Patch availableCNA
MicrosoftWindows Server 202210.0.20348.0 to before 10.0.20348.513910.0.20348.5139Patch availableCNA
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 to before 10.0.25398.233010.0.25398.2330Patch availableCNA
MicrosoftWindows Server 202510.0.26100.0 to before 10.0.26100.3286010.0.26100.32860Patch availableCNA
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 to before 10.0.26100.3286010.0.26100.32860Patch availableCNA
  • Microsoft 365 Apps for Enterprise VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
  • Microsoft Office 2016 VendorMicrosoft Affected 16.0.0 to before 16.0.5556.1000 Fixed in 16.0.5556.1000 Patch available CNA
  • Microsoft Office 2019 VendorMicrosoft Affected 19.0.0 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
  • Microsoft Office LTSC 2021 VendorMicrosoft Affected 16.0.1 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
  • Microsoft Office LTSC 2024 VendorMicrosoft Affected 16.0.0 to before https://aka.ms/OfficeSecurityReleases Fixed in https://aka.ms/OfficeSecurityReleases Patch available CNA
  • Windows 10 Version 1607 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9140 Fixed in 10.0.14393.9140 Patch available CNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.8755 Fixed in 10.0.17763.8755 Patch available CNA
  • Windows 10 Version 21H2 VendorMicrosoft Affected 10.0.19044.0 to before 10.0.19044.7291 Fixed in 10.0.19044.7291 Patch available CNA
  • Windows 10 Version 22H2 VendorMicrosoft Affected 10.0.19045.0 to before 10.0.19045.7417 Fixed in 10.0.19045.7417 Patch available CNA
  • Windows 11 version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7079 Fixed in 10.0.22631.7079 Patch available CNA
  • Windows 11 Version 23H2 VendorMicrosoft Affected 10.0.22631.0 to before 10.0.22631.7219 Fixed in 10.0.22631.7219 Patch available CNA
  • Windows 11 Version 24H2 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.8457 Fixed in 10.0.26100.8457 Patch available CNA
  • Windows 11 Version 25H2 VendorMicrosoft Affected 10.0.26200.0 to before 10.0.26200.8457 Fixed in 10.0.26200.8457 Patch available CNA
  • Windows 11 version 26H1 VendorMicrosoft Affected 10.0.28000.0 to before 10.0.28000.2113 Fixed in 10.0.28000.2113 Patch available CNA
  • Windows Server 2012 VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26079 Fixed in 6.2.9200.26079 Patch available CNA
  • Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26079 Fixed in 6.2.9200.26079 Patch available CNA
  • Windows Server 2012 R2 VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23181 Fixed in 6.3.9600.23181 Patch available CNA
  • Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23181 Fixed in 6.3.9600.23181 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9140 Fixed in 10.0.14393.9140 Patch available CNA
  • Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9140 Fixed in 10.0.14393.9140 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.8755 Fixed in 10.0.17763.8755 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.8755 Fixed in 10.0.17763.8755 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.5139 Fixed in 10.0.20348.5139 Patch available CNA
  • Windows Server 2022, 23H2 Edition (Server Core installation) VendorMicrosoft Affected 10.0.25398.0 to before 10.0.25398.2330 Fixed in 10.0.25398.2330 Patch available CNA
  • Windows Server 2025 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.32860 Fixed in 10.0.26100.32860 Patch available CNA
  • Windows Server 2025 (Server Core installation) VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.32860 Fixed in 10.0.26100.32860 Patch available CNA

CPE configurations NVD · 25

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*before 10.0.14393.9140VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*before 10.0.14393.9140VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*before 10.0.17763.8755VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*before 10.0.17763.8755VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*before 10.0.19044.7291VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*before 10.0.19044.7291VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*before 10.0.19044.7291VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*before 10.0.19045.7291VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*before 10.0.19045.7291VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*before 10.0.19045.7291VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* Versions before 10.0.14393.9140 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* Versions before 10.0.14393.9140 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* Versions before 10.0.17763.8755 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* Versions before 10.0.17763.8755 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* Versions before 10.0.19044.7291 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:* Versions before 10.0.19044.7291 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:* Versions before 10.0.19044.7291 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* Versions before 10.0.19045.7291 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:* Versions before 10.0.19045.7291 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:* Versions before 10.0.19045.7291 Vulnerable ·Microsoft
Show 15 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*before 10.0.22631.7079VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*before 10.0.22631.7079VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*before 10.0.26100.8390VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*before 10.0.26100.8390VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*before 10.0.26200.8457VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*before 10.0.26200.8457VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*before 10.0.28000.2113VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*before 10.0.28000.2113VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*r2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*before 10.0.14393.9140VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*before 10.0.17763.8755VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*before 10.0.20348.5139VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*before 10.0.25398.2330VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*before 10.0.26100.32860VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* Versions before 10.0.22631.7079 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:* Versions before 10.0.22631.7079 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* Versions before 10.0.26100.8390 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:* Versions before 10.0.26100.8390 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* Versions before 10.0.26200.8457 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:* Versions before 10.0.26200.8457 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:* Versions before 10.0.28000.2113 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:* Versions before 10.0.28000.2113 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* Versions before 10.0.14393.9140 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.8755 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions before 10.0.20348.5139 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* Versions before 10.0.25398.2330 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* Versions before 10.0.26100.32860 Vulnerable ·Microsoft

Remediation

Microsoft 17 updates

  • KB5094127
    Security Update
    • Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7417
    • Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7417
    • Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7417
    • Windows 10 Version 22H2 for 32-bit Systems 10.0.19045.7417
    • Windows 10 Version 22H2 for ARM64-based Systems 10.0.19045.7417
    • Windows 10 Version 22H2 for x64-based Systems 10.0.19045.7417
    • Windows Server, version 2004 (Server Core installation) 10.0.19045.7417
  • KB5093998
    Security Update
    • Windows 11 Version 22H2 for ARM64-based Systems 10.0.22631.7219
    • Windows 11 Version 22H2 for x64-based Systems 10.0.22631.7219
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7219
    • Windows 11 Version 23H2 for x64-based Systems 10.0.22631.7219
  • KB5089549
    Security Update
    • Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8457
    • Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8457
    • Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8457
    • Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8457
Show 14 more Microsoft updates
  • KB5089548
    Security Update
    • Windows 11 Version 26H1 for ARM64-based Systems 10.0.28000.2113
    • Windows 11 version 26H1 for x64-based Systems 10.0.28000.2113
  • KB5089466
    Security Hotpatch Update
    • Windows 11 Version 24H2 for ARM64-based Systems 10.0.26100.8390
    • Windows 11 Version 24H2 for x64-based Systems 10.0.26100.8390
    • Windows 11 Version 25H2 for ARM64-based Systems 10.0.26200.8390
    • Windows 11 Version 25H2 for x64-based Systems 10.0.26200.8390
  • KB5087545
    Security Update
    • Windows Server 2022 10.0.20348.5139
    • Windows Server 2022 (Server Core installation) 10.0.20348.5139
  • KB5087544
    Security Update
    • Windows 10 Version 21H2 for 32-bit Systems 10.0.19044.7291
    • Windows 10 Version 21H2 for ARM64-based Systems 10.0.19044.7291
    • Windows 10 Version 21H2 for x64-based Systems 10.0.19044.7291
  • KB5087541
    Security Update
    • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2330
  • KB5087539
    Security Update
    • Windows Server 2025 10.0.26100.32860
    • Windows Server 2025 (Server Core installation) 10.0.26100.32860
  • KB5087538
    Security Update
    • Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8755
    • Windows 10 Version 1809 for x64-based Systems 10.0.17763.8755
    • Windows Server 2019 10.0.17763.8755
    • Windows Server 2019 (Server Core installation) 10.0.17763.8755
  • KB5087537
    Security Update
    • Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9140
    • Windows 10 Version 1607 for x64-based Systems 10.0.14393.9140
    • Windows Server 2016 10.0.14393.9140
    • Windows Server 2016 (Server Core installation) 10.0.14393.9140
  • KB5087471
    Monthly Rollup
    • Windows Server 2012 R2 6.3.9600.23181
    • Windows Server 2012 R2 (Server Core installation) 6.3.9600.23181
  • KB5087470
    Monthly Rollup
    • Windows Server 2012 6.2.9200.26079
    • Windows Server 2012 (Server Core installation) 6.2.9200.26079
  • KB5087424
    Security Hotpatch Update
    • Windows Server 2022 10.0.20348.5074
    • Windows Server 2022 (Server Core installation) 10.0.20348.5074
  • KB5087423
    Security Hotpatch Update
    • Windows Server 2025 10.0.26100.32772
    • Windows Server 2025 (Server Core installation) 10.0.26100.32772
  • KB5087420
    Security Update
    • Windows 11 Version 23H2 for ARM64-based Systems 10.0.22631.7079
  • KB5002578
    Security Update
    • Microsoft Office 2016 (32-bit edition) 16.0.5556.1000
    • Microsoft Office 2016 (64-bit edition) 16.0.5556.1000

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft 365 Apps for Enterprise for 32-bit SystemsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft 365 Apps for Enterprise for 64-bit SystemsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 32-bit editionsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office 2019 for 64-bit editionsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 32-bit editionsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2021 for 64-bit editionsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 32-bit editionsFixed https · //aka.ms/OfficeSecurityReleases
Microsoft Office LTSC 2024 for 64-bit editionsFixed https · //aka.ms/OfficeSecurityReleases

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21530
  2. 2026-10-03 Alias added: GHSA-xp4f-mw6j-jxm8

References

Patch 1

  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-73128 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17367 MSHTML Framework Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17364 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
See all 3427 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences