Microsoft Windows: Denial of Service in Security Account Manager
Summary
A untrusted pointer dereference in the Windows Security Account Manager (SAM) allows an authorized attacker to cause a denial of service over the network. The attacker needs a valid low-privileged account, and the impact is limited to availability. The flaw matters most on servers and shared systems where many users authenticate.
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)
- Windows Server 2025: not listed in the official CVE record; third-party sources differ, so verify with Microsoft
Fixed in
- Microsoft security update of November 2026 (Patch Tuesday), per the official CVE record
- Fixed builds as listed under affected products; the build numbers come from the CVE record and were not verified against the MSRC page
Workaround
Unknown.
Exploitation
- No exploitation known at publication.
- No public proof of concept known.
- CISA SSVC assessment: Exploitation none, Automatable no, Technical Impact partial.
- Secondary sources do not list it in the CISA KEV catalogue; the catalogue was not checked directly.
Our recommendation
- Install the November 2026 Windows security update on all affected systems, starting with domain controllers and servers that accept logons from many users.
- Check the MSRC advisory for revisions and exploitation updates.
- Review which accounts can log on to affected systems and remove unneeded access.
- Monitor systems for service crashes related to the Security Account Manager.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Denial of service – Windows Security Account Manager
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131085, KB5131090, KB5131096, KB5131080, KB5131077, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-112795 msrc.microsoft.com
- CVE.org record CVE-2026-112795 www.cve.org
- Senserva KB 5131090 (Server 2022 update summary) senserva.com
- Senserva KB 5131085 (Server 2019 update summary) senserva.com
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
- BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
- Strix AI CVE-2026-112795 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, 12:27.
Original description (NVD)
Untrusted pointer dereference in Windows Security Account Manager allows an authorized attacker to deny service over a network.
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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