Windows Security Center: Local privilege escalation
Summary
A flaw in Windows Security Center (CWE-923, improper restriction of communication channel to intended endpoints) allows an attacker with a local, low-privilege account to gain higher privileges on the affected system. The attacker must already be able to run code on the device, for example after phishing or through a malicious app. Microsoft rates exploitation as less likely, and the sources show no public exploit.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (including Server Core): builds before 10.0.14393.9612
- Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds before 10.0.17763.9376
- Windows 10 Version 21H2: builds before 10.0.19044.7807
- Windows 10 Version 22H2: builds before 10.0.19045.7807
- Windows 11 Version 23H2: builds before 10.0.22631.7652
- Windows 11 Version 24H2: builds before 10.0.26100.9711
- Windows 11 Version 25H2: builds before 10.0.26200.9711
- Windows 11 Version 26H1: builds before 10.0.28000.3231
- Windows 11 Version 26H2: builds before 10.0.26300.9711
Fixed in
- Windows 10 Version 1607 and Windows Server 2016: build 10.0.14393.9612 via KB5126868 (October 2026 cumulative update)
- Other branches: fixed in the builds listed under affected, per the CVE record. Confirm the KB numbers on the MSRC page.
Workaround
Unknown. No CVE-specific workaround is documented; patching is the only documented fix.
Exploitation
- Microsoft rates exploitation as less likely.
- CISA SSVC assessment: exploitation none, not automatable, total technical impact.
- No public proof of concept found. No CISA KEV listing found in the sources; verify in the KEV catalog.
Our recommendation
- Install the October 2026 update (KB5126868 for Windows 10 1607 and Server 2016, or its successor) on all affected systems.
- Identify remaining Windows 10 1607 and Server 2016 systems and verify their support and ESU status before relying on the patch.
- Plan the migration of systems that are out of support.
- Restrict local accounts and monitor for privilege escalation on shared PCs, terminal servers and kiosks.
Information from Microsoft (Patch Tuesday October 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Security Center
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5126868, KB5126651, KB5126657, KB5126653, KB5127648, KB5127646
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-70212 msrc.microsoft.com
- Vulners: CVE-2026-70212 (CVE list) vulners.com
- Vulners: CVE-2026-70212 (NVD) vulners.com
- Layerlogix: Windows October 2026 vulnerabilities layerlogix.com
- NinjaOne KB catalog: KB5126868 www.ninjaone.com
- Microsoft Update Catalog: KB5126868 catalog.update.microsoft.com
- Microsoft Learn: Windows 10 1607 and Server 2016 release health learn.microsoft.com
- Pureinfotech: Windows 10 ESU October 2026 update pureinfotech.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 4 Nov 2026, 09:03.
Original description (NVD)
Improper restriction of communication channel to intended endpoints in Windows Security Center 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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