Microsoft Windows Error Reporting: Elevation of privilege via double free
Summary
A double free vulnerability in Windows Error Reporting allows a local attacker with low privileges to elevate privileges on the affected Windows system. The attacker must already be able to run code or log on to the machine, and no user interaction is required. Attack complexity is rated high. Successful exploitation could fully compromise confidentiality, integrity and availability.
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, according to a third-party source; not confirmed by Microsoft)
Fixed in
- Install the Microsoft cumulative update for each affected build (fixed builds as listed in the CVE record; verify against the MSRC entry)
- Fixed build for Windows Server 2022: unverified, check the MSRC Security Update Guide and the KB article
Workaround
Unknown. No workaround is described in the sources; the vendor patch is the only remedy identified.
Exploitation
- Exploited in the wild: no evidence found
- Public proof of concept: none found
- CISA SSVC: exploitation none, automatable no, technical impact total
- Microsoft exploit code maturity: unproven
Our recommendation
- Install the Microsoft security update on all affected Windows 10, Windows 11 and Windows Server systems in the normal monthly cycle.
- Prioritise endpoints where standard users log on, shared workstations and terminal servers.
- Check whether Windows 10 1607, 1809 and 21H2 still receive security updates; plan an upgrade if they do not.
- Verify installation of the patch on every affected build, and check the MSRC advisory before relying on the build numbers.
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 unlikely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131085, KB5131090, KB5131096, KB5131080, KB5131077, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE.org record www.cve.org
- Microsoft Security Update Guide (MSRC advisory) msrc.microsoft.com
- Strix (third-party CVE details) www.strix.ai
- CVE list release (publication timing) github.com
- Senserva KB 5131090 (third-party, Server 2022 update) senserva.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, 08:14.
Original description (NVD)
Double free 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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