Windows Rich Text Edit
CVE-2026-21530 — Windows Rich Text Edit Elevation of Privilege Vulnerability
Executive Summary
Double free in Windows Rich Text Edit allows an authorized attacker to elevate privileges locally.
Overview
6.7
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
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
ATTACK VECTOR
Local
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
Required
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.8
EPSS Score
0.00319
probability of exploitation in the next 30 days
0.23463 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
33 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft 365 Apps for Enterprise for 32-bit Systems | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft 365 Apps for Enterprise for 64-bit Systems | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office 2016 (32-bit edition) | 5002578 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Office 2016 (64-bit edition) | 5002578 (Security Update) |
Important | Elevation of Privilege | Maybe |
| Microsoft Office 2019 for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office 2019 for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office LTSC 2021 for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office LTSC 2021 for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office LTSC 2024 for 32-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Microsoft Office LTSC 2024 for 64-bit editions | Click to Run (Security Update) |
Important | Elevation of Privilege | No |
| Windows 10 Version 1607 for 32-bit Systems | 5087537 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5087537 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5087538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5087538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5087544 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5087544 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5087544 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5094127 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5094127 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5094127 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5087420 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5093998 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems 5089549 (Security Update) 5089466 (Security Hotpatch Update) Important Elevation of Privilege 5082063 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.26100.8457 10.0.26100.8390 Yes None Windows 11 Version 24H2 for x64-based Systems 5089549 (Security Update) 5089466 (Security Hotpatch Update) Important Elevation of Privilege 5082063 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.26100.8457 10.0.26100.8390 Yes None Windows 11 Version 25H2 for ARM64-based Systems 5089549 (Security Update) 5089466 (Security Hotpatch Update) Important Elevation of Privilege 5083769 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.26200.8457 10.0.26200.8390 Yes None Windows 11 Version 25H2 for x64-based Systems 5089549 (Security Update) 5089466 (Security Hotpatch Update) Important Elevation of Privilege 5083769 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.26200.8457 10.0.26200.8390 Yes None Windows 11 Version 26H1 for ARM64-based Systems | 5089548 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 11 version 26H1 for x64-based Systems | 5089548 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 | 5087470 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 (Server Core installation) | 5087470 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 | 5087471 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5087471 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 | 5087537 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 5087537 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 5087538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 5087538 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2022 5087545 (Security Update) 5087424 (Security Hotpatch Update) Important Elevation of Privilege 5082142 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.20348.5139 10.0.20348.5074 Yes None Windows Server 2022 (Server Core installation) 5087545 (Security Update) 5087424 (Security Hotpatch Update) Important Elevation of Privilege 5082142 Base: 6.7 Temporal: 5.8 Vector: 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 10.0.20348.5139 10.0.20348.5074 Yes None Windows Server 2022, 23H2 Edition (Server Core installation) | 5087541 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
12 patches
| Article | Type | Restart |
|---|---|---|
Click to Run |
Security Update | No |
5002578 |
Security Update | Maybe |
5087537 |
Security Update | Yes |
5087538 |
Security Update | Yes |
5087544 |
Security Update | Yes |
5094127 |
Security Update | Yes |
5087420 |
Security Update | Yes |
5093998 |
Security Update | Yes |
5089548 |
Security Update | Yes |
5087470 |
Monthly Rollup | Yes |
5087471 |
Monthly Rollup | Yes |
5087541 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
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