Windows Error Reporting: Local privilege escalation via resource transfer
Summary
A flaw in the Windows Error Reporting service allows an authorized local user to elevate privileges through an incorrect resource transfer between spheres (CWE-669). Microsoft states that a successful attacker could gain SYSTEM privileges. The attacker needs a local logon or code execution on the system plus a low-privilege account, and exploitation is rated as complex (AC:H).
Affected
- Windows 10 Version 1607 (10.0.14393.0 before 10.0.14393.9688)
- Windows 10 Version 1809 (10.0.17763.0 before 10.0.17763.9487)
- Windows 10 Version 21H2 (10.0.19044.0 before 10.0.19044.7846)
- Windows 10 Version 22H2 (10.0.19045.0 before 10.0.19045.7846)
- Windows 11 Version 23H2 (10.0.22631.0 before 10.0.22631.7711)
- Windows 11 Version 24H2 (10.0.26100.0 before 10.0.26100.9974)
- Windows 11 Version 25H2 (10.0.26200.0 before 10.0.26200.9974)
- Windows 11 Version 26H1 (10.0.28000.0 before 10.0.28000.3501)
- Windows 11 Version 26H2 (10.0.26300.0 before 10.0.26300.9974)
- Windows Server 2016 incl. Server Core (10.0.14393.0 before 10.0.14393.9688)
- Windows Server 2019 incl. Server Core (10.0.17763.0 before 10.0.17763.9487)
- Windows Server 2022 (10.0.20348.0 before 10.0.20348.5870)
The full product table is on the MSRC page; verify it there.
Fixed in
Security updates of 10 November 2026. Fixed builds according to the CVE record are listed under 'affected'. KB numbers per edition: Unknown. Use the MSRC Security Updates section.
Workaround
Unknown.
Exploitation
- Microsoft lists the vulnerability as not exploited at publication.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof-of-concept exploit found.
- CVSS 3.1 exploit maturity is 'unproven' (E:U).
Our recommendation
- Install the November 2026 security update on all affected Windows clients and servers, prioritising multi-user systems, terminal servers and shared workstations.
- Verify the installed build number after patching.
- Limit local accounts and restrict logon rights on critical systems.
- Monitor for changes on the MSRC advisory and the CISA KEV catalogue, as exploit status may change quickly.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Error Reporting
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-105540 msrc.microsoft.com
- CVE Record: CVE-2026-105540 www.cve.org
- Strix: CVE-2026-105540 (third-party, unverified ranges) www.strix.ai
- Rapid7: Patch Tuesday November 2026 www.rapid7.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 11 Nov 2026, 09:41.
Original description (NVD)
Incorrect resource transfer between spheres in Windows Error Reporting 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.
Affected? We can help.
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