CVE-2026-62693: Windows MIDI Service Module Elevation of Privileges Vulnerability
CVE-2026-62693 is an elevation of privilege vulnerability in Windows MIDI Service Module Elevation of Privileges, rated Important by Microsoft, with a CVSS 3.1 base score of 7 (High). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as unlikely. The EPSS model estimates a 0.20% probability of exploitation activity in the next 30 days, higher than 10% of all scored vulnerabilities. Microsoft released the fix on 11 August 2026 in the August 2026 Patch Tuesday, delivered through 3 security updates (KB5121003, KB5120994, KB5121000). It affects 6 products in 1 product family (Windows).
Key facts
- CVE ID
- CVE-2026-62693
- Severity
- High CVSS 7
- Microsoft severity
- Important
- Impact
- Elevation of Privilege
- Exploited in the wild
- No
- Publicly disclosed
- No
- Exploitation likelihood
- Unlikely
- Weakness
- CWE-362; CWE-416
- EPSS
- 0.20% (percentile 10%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- August 2026 Patch Tuesday
- Product families
- Windows
CVSS score and vector
Microsoft scores CVE-2026-62693 at 7 (temporal 6.1) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
| Metric | Value |
|---|---|
| Attack vector | Local |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
| Exploit code maturity | Unproven |
| Remediation level | Official fix |
| Report confidence | Confirmed |
Description
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.
Frequently asked questions (Microsoft)
What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.
Affected products (6)
Windows
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| Windows 11 Version 25H2 for ARM64-based Systems | KB5121003 KB5120994 | Security Update Security Hotpatch Update | 10.0.26200.9168 10.0.26200.9106 | Yes Yes |
| Windows 11 Version 25H2 for x64-based Systems | KB5121003 KB5120994 | Security Update Security Hotpatch Update | 10.0.26200.9168 10.0.26200.9106 | Yes Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | ||||
| Windows 11 Version 24H2 for x64-based Systems | ||||
| Windows 11 version 26H1 for x64-based Systems | KB5121000 | Security Update | 10.0.28000.2704 | Yes |
| Windows 11 Version 26H1 for ARM64-based Systems | KB5121000 | Security Update | 10.0.28000.2704 | Yes |
Security updates (3)
NIST NVD data
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| windows 11 24h2 (arm64) | before 10.0.26100.9106 |
| windows 11 24h2 (x64) | before 10.0.26100.9106 |
| windows 11 25h2 (arm64) | before 10.0.26200.9106 |
| windows 11 25h2 (x64) | before 10.0.26200.9106 |
| windows 11 26h1 (arm64) | before 10.0.28000.2704 |
| windows 11 26h1 (x64) | before 10.0.28000.2704 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62693 (Patch, Vendor Advisory)
Acknowledgments
- Anonymous
- h4urek and Bocheng Xiang with secsys lab
- haowei yan
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Updated an acknowledgement. This is an informational change only. |