Microsoft Windows: Local privilege escalation in Overlay Filter (CVE-2026-112813)
Summary
A race condition (CWE-362) combined with an untrusted pointer dereference (CWE-822) in the Windows Overlay Filter allows a locally authorized user to elevate privileges. The CVSS 3.1 vector rates the attack as local with high complexity, low privileges required, and impact on availability only. Exploitation requires an existing local logon or foothold on the affected system.
Affected
- Windows 10 Version 1607 and Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
- Windows 10 Version 1809 and Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
- Windows 10 Version 21H2: builds before 10.0.19044.7846
- Windows 10 Version 22H2: builds before 10.0.19045.7846
- Windows 11 Version 23H2: builds before 10.0.22631.7711
- Windows 11 Version 24H2: builds before 10.0.26100.9974
- Windows 11 Version 25H2 and 26H2: builds before 10.0.26200.9974 and 10.0.26300.9974
- Windows 11 Version 26H1: builds before 10.0.28000.3501
- Windows Server 2022: builds before 10.0.20348.5870
- Note: sources conflict on some builds; verify on the MSRC update guide.
Fixed in
- Fixed in the November 2026 cumulative updates for the builds listed above.
- Unknown: the exact KB numbers for each product. Third-party pages list KB5131080, KB5131085, KB5131087 and KB5132061, but these are unverified.
Workaround
- Unknown. No Microsoft-published workaround was found.
- Applying the November 2026 security update is the practical mitigation.
Exploitation
- No known in-the-wild exploitation.
- CISA SSVC assessment: exploitation none, not automatable, total technical impact.
- No public proof of concept found; this is not a confirmed absence.
- NVD analysis was pending at publication.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows 10, Windows 11 and Windows Server systems through the normal patch cycle, with medium priority.
- Prioritise multi-user systems such as terminal servers, RDS hosts and file servers.
- Confirm the installed build on each host after patching.
- Limit local logon rights and monitor for unusual privilege changes on shared systems.
- Plan for reboots and regression testing, as the update volume that month is high.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Overlay Filter
- 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 Response Center: CVE-2026-112813 msrc.microsoft.com
- CVE.org record CVE-2026-112813 www.cve.org
- Strix: CVE-2026-112813 www.strix.ai
- Senserva KB5131085 (third-party, unverified KB mapping) 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, 20:56.
Original description (NVD)
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Overlay Filter 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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