Microsoft Windows: Information disclosure in Windows Overlay Filter
Summary
A local information disclosure vulnerability exists in the Windows Overlay Filter component (wof.sys) of Microsoft Windows 10, Windows 11 and Windows Server. An authenticated local user with low privileges can read data they should not access, with an impact on confidentiality only. The attack requires local access and is not reachable over the network. Microsoft rates the vulnerability CVSS 5.5 (medium).
Affected
- Windows 10 Version 1607 (before 10.0.14393.9688)
- Windows 10 Version 1809 (before 10.0.17763.9487)
- Windows 10 Version 21H2 (before 10.0.19044.7846)
- Windows 10 Version 22H2 (before 10.0.19045.7846)
- Windows 11 Version 23H2 (before 10.0.22631.7711)
- Windows 11 Version 24H2 (before 10.0.26100.9974)
- Windows 11 Version 25H2 (before 10.0.26200.9974)
- Windows 11 Version 26H1 (before 10.0.28000.3501)
- Windows 11 Version 26H2 (before 10.0.26300.9974)
- Windows Server 2016, including Server Core (before 10.0.14393.9688)
- Windows Server 2019, including Server Core (before 10.0.17763.9487)
- Windows Server 2022 (before 10.0.20348.5870)
Fixed in
- Security update from the November 2026 Patch Tuesday, fixed in the builds listed above.
- Build numbers are taken from the CVE record. Verify them on the MSRC page before rollout.
- Third-party summaries name KB5131080 and KB5131087 as carriers. These KB numbers are not verified.
Workaround
Unknown. No workaround is documented by the vendor. Install the update.
- Interim risk reduction (not from a vendor source): limit local interactive logons on shared hosts and terminal servers, and apply least privilege.
Exploitation
- No public exploit known.
- Not listed in the CISA KEV catalog in the data reviewed. CISA SSVC: exploitation none, not automatable.
- No evidence of exploitation in the wild.
Our recommendation
- Install the November 2026 cumulative update on all affected Windows hosts in the regular monthly patch cycle.
- Prioritise multi-user servers and RDS/terminal servers.
- Verify the fixed builds on the MSRC page before rollout, because the sources differ.
- Restrict local logons on shared systems.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Information disclosure – 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 Update Guide: CVE-2026-112750 msrc.microsoft.com
- CVE.org record CVE-2026-112750 (Microsoft CNA) www.cve.org
- VulDB entry 434864 vuldb.com
- Senserva summary KB5131080 senserva.com
- Senserva summary KB5131087 senserva.com
- Strix AI CVE-2026-112750 (third-party) www.strix.ai
- Microsoft Learn: Windows image file boot (WIM/WoF background) learn.microsoft.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, 16:55.
Original description (NVD)
Numeric truncation error in Windows Overlay Filter allows an authorized attacker to disclose information 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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