Microsoft Windows Storage Spaces Controller: Elevation of privilege via use-after-free
Summary
A use-after-free flaw (CWE-416) in the Windows Storage Spaces Controller allows an authorized local attacker to elevate privileges. The attack requires local access with low privileges and no user interaction. Microsoft has released fixes; the CVE is not known to be exploited in the wild.
Affected
- Windows 11 Version 24H2 (10.0.26100.0 to before 10.0.26100.9711)
- Windows 11 Version 25H2 (10.0.26200.0 to before 10.0.26200.9711)
- Windows 11 Version 26H1 (10.0.28000.0 to before 10.0.28000.3231)
- Windows 11 Version 26H2 (10.0.26300.0 to before 10.0.26300.9711)
- Windows Server 2025 incl. Server Core (10.0.26100.0 to before 10.0.26100.33650)
Fixed in
- Windows 11 24H2: 10.0.26100.9711
- Windows 11 25H2: 10.0.26200.9711
- Windows 11 26H1: 10.0.28000.3231
- Windows 11 26H2: 10.0.26300.9711
- Windows Server 2025 incl. Server Core: 10.0.26100.33650
Version numbers are taken from third-party aggregators; verify against the MSRC advisory. KB numbers: unknown.
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild found.
- Not listed in CISA KEV; CISA SSVC rates exploitation as none and automatable as no.
- Microsoft rates exploit code maturity as Unproven.
- No public proof-of-concept found; EPSS below 1%.
Our recommendation
- Install the cumulative update for the affected Windows release, starting with servers (Windows Server 2025) and then workstations.
- Verify the fixed build numbers in the MSRC advisory.
- Limit local logon and restrict low-privilege accounts on file servers and shared workstations where Storage Spaces is used.
- Monitor for unexpected privilege escalation on endpoints.
Information from Microsoft (Patch Tuesday October 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Response Center: CVE-2026-88100 msrc.microsoft.com
- OpenCVE: CVE-2026-88100 app.opencve.io
- Vulners MSCVE: MS:CVE-2026-88100 vulners.com
- Strix: CVE-2026-88100 www.strix.ai
- OffSeq Radar: CVE-2026-88100 radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 01:26.
Original description (NVD)
Use after free in Windows Storage Spaces Controller allows an authorized attacker to elevate privileges locally.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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