Windows DIAL Client: Use after free allows local privilege escalation
Summary
A use-after-free memory corruption flaw (CWE-416) in the Windows DIAL Client component allows an authorized local user to elevate privileges. The CVSS vector rates the impact as high for confidentiality, integrity and availability. Exploitation requires local access and a low-privilege account, so the risk is mainly relevant after an attacker or malware has already gained a foothold on a system. Microsoft rates exploitation as unproven and no public exploit has been found.
Affected
- Windows 10 Version 1607: 10.0.14393.0 to before 10.0.14393.9688
- Windows 10 Version 1809: 10.0.17763.0 to before 10.0.17763.9487
- Windows 10 Version 21H2: 10.0.19044.0 to before 10.0.19044.7846
- Windows 10 Version 22H2: Unknown (CNA record text truncated; secondary source lists 10.0.19045.0 to before 10.0.19045.7846, unverified)
- Windows 11 Version 23H2: 10.0.22631.0 to before 10.0.22631.7711 (listed in the CNA record; not verified on MSRC)
- Windows 11 Version 24H2, 25H2, 26H1, 26H2: listed in the CNA record; exact fixed builds to be verified on MSRC
- Windows Server 2016 (including Server Core): 10.0.14393.0 to before 10.0.14393.9688
- Windows Server 2019 (including Server Core): 10.0.17763.0 to before 10.0.17763.9487
- Windows Server 2022: 10.0.20348.0 to before 10.0.20348.5870
Fixed in
- Windows 10 Version 1607 / Windows Server 2016: build 10.0.14393.9688
- Windows 10 Version 1809 / Windows Server 2019: build 10.0.17763.9487
- Windows 10 Version 21H2: build 10.0.19044.7846
- Windows 10 Version 22H2: 10.0.19045.7846 (unverified, secondary source)
- Windows 11 Version 23H2: 10.0.22631.7711 (to be verified on MSRC)
- Windows Server 2022: build 10.0.20348.5870
- Other listed versions: Unknown, verify on MSRC
Workaround
Unknown.
Exploitation
- Exploited in the wild: No evidence found.
- Public proof of concept: None found.
- CISA KEV listing: Not found.
- Microsoft exploit maturity: Unproven. CISA SSVC: exploitation none, not automatable, total technical impact.
Our recommendation
- Install the Microsoft security update for the affected Windows and Windows Server versions in the next monthly patch cycle, and sooner on servers and older Windows 10 builds.
- Check the MSRC advisory for the exact fixed build of each system before rollout.
- Restrict local logon on shared workstations and terminal servers and review low-privilege accounts.
- Monitor for changes to exploitation status in MSRC and CISA KEV, as NVD analysis is still pending.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows DIAL Client
- 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
- CVE Record (Microsoft CNA) www.cve.org
- MSRC Security Update Guide msrc.microsoft.com
- Strix aggregator (secondary, unverified versions) www.strix.ai
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, 02:38.
Original description (NVD)
Use after free in Windows DIAL Client 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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