Microsoft Windows: Information disclosure in Windows Inventory Backup
Summary
A use of externally controlled format string in the Windows Inventory Backup component allows an authorized local attacker to disclose information. Microsoft rates the impact as confidentiality only, with small portions of stack memory potentially readable. Exploitation requires a local account on the affected system, so the risk is mainly on shared or multi-user Windows systems.
Affected
- Windows 10 Version 21H2: builds 10.0.19044.0 before 10.0.19044.7846
- Windows 10 Version 22H2: builds 10.0.19045.0 before 10.0.19045.7846
- Windows 11 Version 23H2: builds 10.0.22631.0 before 10.0.22631.7711
- Windows 11 Version 24H2: builds 10.0.26100.0 before 10.0.26100.9974
- Windows 11 Version 25H2: builds 10.0.26200.0 before 10.0.26200.9974
- Windows 11 Version 26H1: builds 10.0.28000.0 before 10.0.28000.3501
- Windows 11 Version 26H2: builds 10.0.26300.0 before 10.0.26300.9974
- Windows Server 2025 (including Server Core): builds 10.0.26100.0 before 10.0.26100.33822
Fixed in
- Install the Microsoft security update of 10 November 2026 or later for each affected version.
- Minimum fixed builds: 10.0.19044.7846 (21H2), 10.0.19045.7846 (22H2), 10.0.22631.7711 (23H2), 10.0.26100.9974 (24H2), 10.0.26200.9974 (25H2), 10.0.28000.3501 (26H1), 10.0.26300.9974 (26H2), 10.0.26100.33822 (Server 2025).
- Confirm the exact build for your architecture (x64/ARM64) in the MSRC table.
Workaround
Unknown.
Exploitation
- Microsoft: Exploited: No.
- No publicly available exploit code is known.
- CISA SSVC: exploitation none, not automatable, technical impact partial.
Our recommendation
- Include the November 2026 cumulative update in the regular patch rollout.
- Prioritise multi-user servers, terminal and RDP servers, and shared PCs.
- Review which users and contractors have local logons on these systems.
- Verify the installed build after patching.
- No emergency action is indicated on current information.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – Windows Inventory Backup
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131096, KB5131087, KB5132061, KB5132043, KB5131080, KB5131077
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-105584 msrc.microsoft.com
- CVE.org record CVE-2026-105584 www.cve.org
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 11 Nov 2026, 16:58.
Original description (NVD)
Use of externally-controlled format string in Windows Inventory Backup allows an authorized attacker to disclose information 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.
Affected? We can help.
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