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7.8
CVE-2026-87706: Windows 10/11 Storage Spaces can let attackers gain admin rights
CVE-2026-87706 · published 22 days ago
Summary
The Storage Spaces component in Windows 10 (versions 1607, 1809, 21H2, 22H2) and Windows 11 (version 23H2) has a flaw that could let someone with normal user access increase their rights to administrator on the same machine. This could allow the attacker to bypass security controls and access sensitive data or install software. Install the latest Windows updates, which contain the fix, and ensure systems are kept current.
What to do
- Update microsoft windows 10 version 1607 to version 10.0.14393.9512 or later.
- Update microsoft windows 10 version 1809 to version 10.0.17763.9245 or later.
- Update microsoft windows 10 version 21h2 to version 10.0.19044.7725 or later.
- Update microsoft windows 10 version 22h2 to version 10.0.19045.7725 or later.
- Update microsoft windows 11 version 23h2 to version 10.0.22631.7582 or later.
- Update microsoft windows 11 version 24h2 to version 10.0.26100.9445 or later.
- Update microsoft windows 11 version 25h2 to version 10.0.26200.9445 or later.
- Update microsoft windows 11 version 26h1 to version 10.0.28000.2954 or later.
- Update microsoft windows server 2012 to version 6.2.9200.26349 or later.
- Update microsoft windows server 2012 (server core installation) to version 6.2.9200.26349 or later.
- Update microsoft windows server 2012 r2 to version 6.3.9600.23398 or later.
- Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.23398 or later.
- Update microsoft windows server 2016 to version 10.0.14393.9512 or later.
- Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9512 or later.
- Update microsoft windows server 2019 to version 10.0.17763.9245 or later.
- Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9245 or later.
- Update microsoft windows server 2022 to version 10.0.20348.5622 or later.
- Update microsoft windows server 2025 to version 10.0.26100.33438 or later.
- Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33438 or later.
- Update microsoft windows_10_1607 to version 10.0.14393.9612 or later.
- Update microsoft windows_10_1809 to version 10.0.17763.9376 or later.
- Update microsoft windows_10_21h2 to version 10.0.19044.7807 or later.
- Update microsoft windows_10_22h2 to version 10.0.19045.7807 or later.
- Update microsoft windows_11_23h2 to version 10.0.22631.7652 or later.
- Update microsoft windows_11_24h2 to version 10.0.26100.9711 or later.
- Update microsoft windows_11_25h2 to version 10.0.26200.9711 or later.
- Update microsoft windows_11_26h1 to version 10.0.28000.3231 or later.
- Update microsoft windows_server_2016 to version 10.0.14393.9612 or later.
- Update microsoft windows_server_2019 to version 10.0.17763.9376 or later.
- Update microsoft windows_server_2022 to version 10.0.20348.5761 or later.
- Update microsoft windows_server_2025 to version 10.0.26100.33650 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| microsoft | windows 10 version 1607 | < 10.0.14393.9512 |
| microsoft | windows 10 version 1809 | < 10.0.17763.9245 |
| microsoft | windows 10 version 21h2 | < 10.0.19044.7725 |
| microsoft | windows 10 version 22h2 | < 10.0.19045.7725 |
| microsoft | windows 11 version 23h2 | < 10.0.22631.7582 |
| microsoft | windows 11 version 24h2 | < 10.0.26100.9445 |
| microsoft | windows 11 version 25h2 | < 10.0.26200.9445 |
| microsoft | windows 11 version 26h1 | < 10.0.28000.2954 |
| microsoft | windows server 2012 | < 6.2.9200.26349 |
| microsoft | windows server 2012 (server core installation) | < 6.2.9200.26349 |
| microsoft | windows server 2012 r2 | < 6.3.9600.23398 |
| microsoft | windows server 2012 r2 (server core installation) | < 6.3.9600.23398 |
| microsoft | windows server 2016 | < 10.0.14393.9512 |
| microsoft | windows server 2016 (server core installation) | < 10.0.14393.9512 |
| microsoft | windows server 2019 | < 10.0.17763.9245 |
| microsoft | windows server 2019 (server core installation) | < 10.0.17763.9245 |
| microsoft | windows server 2022 | < 10.0.20348.5622 |
| microsoft | windows server 2025 | < 10.0.26100.33438 |
| microsoft | windows server 2025 (server core installation) | < 10.0.26100.33438 |
| microsoft | windows_10_1607 |
< 10.0.14393.9612 cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_1809 |
< 10.0.17763.9376 cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_21h2 |
< 10.0.19044.7807 cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_10_22h2 |
< 10.0.19045.7807 cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_23h2 |
< 10.0.22631.7652 cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_24h2 |
< 10.0.26100.9711 cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_25h2 |
< 10.0.26200.9711 cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_26h1 |
< 10.0.28000.3231 cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:* |
| microsoft | windows_server_2012 |
r2 cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 |
< 10.0.14393.9612 cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:* |
| microsoft | windows_server_2019 |
< 10.0.17763.9376 cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:* |
| microsoft | windows_server_2022 |
< 10.0.20348.5761 cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:* |
| microsoft | windows_server_2025 |
< 10.0.26100.33650 cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:* |
Original advisory text
Windows Storage Spaces Controller Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-87706 vendor-advisory patch
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Type
CWE-122Heap-based Buffer Overflow
Timeline
Published13 Oct 2026
Updated4 Nov 2026
First seen13 Oct 2026
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