Microsoft Windows Error Reporting: Elevation of privilege
Summary
A local elevation of privilege vulnerability in the Windows Error Reporting (WER) crash-reporting component allows the handling and execution of files to be abused. An attacker who already has local code execution with low privileges, for example by running a specially crafted application, could gain higher privileges, access sensitive information and affect system functionality. The CVSS base score is 7.8 (High). Microsoft has released a security update.
Affected
- Windows 10 Version 1607, 1809, 21H2 and 22H2
- Windows 11 Version 23H2, 24H2, 25H2, 26H1 and 26H2
- Windows Server 2016 (including Server Core), 2019 (including Server Core) and 2022
- Exact affected builds according to the CNA record: 10.0.14393.0 to before 10.0.14393.9688 (Windows 10 1607, Server 2016); 10.0.17763.0 to before 10.0.17763.9487 (1809, Server 2019); 10.0.19044.0 to before 10.0.19044.7846 (21H2); 10.0.19045.0 to before 10.0.19045.7846 (22H2); 10.0.20348.0 to before 10.0.20348.5870 (Server 2022); 10.0.22631.0 to before 10.0.22631.7711 (23H2); 10.0.26100.0 to before 10.0.26100.9974 (24H2); 10.0.26200.0 to before 10.0.26200.9974 (25H2); 10.0.26300.0 to before 10.0.26300.9974 (26H2); 10.0.28000.0 to before 10.0.28000.3501 (26H1)
- The product list has not been verified against the MSRC advisory.
Fixed in
- Install the Microsoft security update for November 2026 (released 2026-11-10) for each affected build.
- Fixed builds according to the CNA record: 10.0.14393.9688 or later (Windows 10 1607 and Server 2016); 10.0.17763.9487 or later (1809 and Server 2019); 10.0.19044.7846 or later (21H2); 10.0.19045.7846 or later (22H2); 10.0.20348.5870 or later (Server 2022); 10.0.22631.7711 or later (23H2); 10.0.26100.9974 or later (24H2); 10.0.26200.9974 or later (25H2); 10.0.26300.9974 or later (26H2); 10.0.28000.3501 or later (26H1).
- The KB number per build is unknown; check the MSRC advisory.
Workaround
Unknown. No vendor-documented workaround has been identified.
Exploitation
- Not listed as actively exploited in the wild; CISA SSVC assessment: exploitation none, not automatable, total technical impact.
- No public proof-of-concept exploit found at the time of writing.
- The CVE was published only hours before this entry; the status may change.
Our recommendation
- Install the November 2026 Windows security update on all affected systems, prioritising multi-user systems, Remote Desktop and terminal servers.
- Check the MSRC advisory for the verified affected products and KB numbers before rollout.
- Verify the support lifecycle of Windows 10 1607 and 1809 and plan upgrades if they are out of support.
- Monitor CISA KEV and vendor channels for exploitation updates and re-assess the priority.
- Keep endpoint protection and privilege management in place, as local privilege escalation is often used after an initial compromise.
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-2026-95947 msrc.microsoft.com
- CVE Record CVE-2026-95947 (CVE.org) www.cve.org
- Rapid7: Patch Tuesday November 2026 review www.rapid7.com
- Trinetri Ops: Patch Tuesday November 2026 trinetriops.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, 02:56.
Original description (NVD)
An elevation of privilege vulnerability exists in Windows Error Reporting (WER) when WER handles and executes files. The vulnerability could allow elevation of privilege if an attacker can successfully exploit it. An attacker who successfully exploited the vulnerability could gain greater access to sensitive information and system functionality. To exploit the vulnerability, an attacker could run a specially crafted application. The security update addresses the vulnerability by correcting the way that WER handles and executes files.
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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