Microsoft Windows Installer: Elevation of privilege via integer overflow
Summary
Windows Installer contains an integer overflow or wraparound (CWE-190, CWE-122) that allows an authorized local attacker with low privileges to gain higher privileges on the system. The CVSS vector rates confidentiality, integrity and availability impact as high. No public exploit was known at publication, and Microsoft's CISA SSVC assessment lists no exploitation and no automatable path.
Affected
- Windows 10 Version 1607: builds before 10.0.14393.9688
- Windows 10 Version 1809: 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: builds before 10.0.26200.9974
- Windows 11 Version 26H1: builds before 10.0.28000.3501
- Windows 11 Version 26H2: builds before 10.0.26300.9974
- Windows Server 2016 (including Server Core): builds before 10.0.14393.9688
- Windows Server 2019 (including Server Core): builds before 10.0.17763.9487
- Windows Server 2022: builds before 10.0.20348.5870
Fixed in
- Fixed in the November 2026 security update for the listed Windows versions and builds. Verify the exact KB article on the MSRC page.
Workaround
Unknown. No vendor workaround was found in the sources reviewed.
Exploitation
- No public proof-of-concept exploit known at publication.
- No confirmed exploitation in the wild found in the sources reviewed.
- Attack requires local access with low privileges and no user interaction.
Our recommendation
- Deploy the November 2026 cumulative update, starting with servers, terminal servers, file servers and multi-user systems.
- Verify build numbers and the KB mapping on the MSRC advisory before rollout.
- Move Windows 11 23H2 Enterprise and Education devices to a supported version, as they receive no updates after November 2026.
- Limit local logons on shared machines and review local administrator rights.
- Re-check for exploitation news, since the CVE was only recently published.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Installer
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5132061, KB5132043, KB5131080, KB5131077, KB5132059, KB5131291
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-113847 msrc.microsoft.com
- CVE Record CVE-2026-113847 www.cve.org
- Microsoft Windows message center (release health) learn.microsoft.com
- Talos: Microsoft Patch Tuesday November 2026 blog.talosintelligence.com
- Qualys: Microsoft Patch Tuesday November 2026 review blog.qualys.com
- Zero Day Initiative: November 2026 security update review www.zerodayinitiative.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, 04:07.
Original description (NVD)
Integer overflow or wraparound in Windows Installer 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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