Microsoft Office Word: Remote code execution vulnerability
Summary
Microsoft Word contains a numeric truncation flaw that Microsoft classifies as remote code execution. An unauthenticated attacker can execute code on a victim's system if the user opens a manipulated document, for example one received by email or download. The CVSS 3.1 base score is 8.8, and user interaction is required.
Affected
- Microsoft 365 Apps for Enterprise (Windows): 16.0.1 up to the fixed build (exact fixed build unknown)
- Microsoft Office 365 for Mac: 1.0.0 to < 16.115.26110837
- Office LTSC 2021: 16.0.1 to < 16.0.14334.21048
- Office LTSC 2024: 16.0.0 to < 16.0.17932.21140
- Office LTSC for Mac 2021: 16.0.1 to < 16.115.26110837
- Office LTSC for Mac 2024: 16.0.0 to < 16.115.26110837
Fixed in
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140 (from a third-party aggregator, not confirmed against the CVE record)
- Office 365 for Mac, Office LTSC for Mac 2021 and 2024: 16.115.26110837
- Microsoft 365 Apps for Enterprise: Unknown; see the Microsoft Security Update Guide
Workaround
- Unknown. No workaround is documented in the sources reviewed.
- Until patched, be cautious with unexpected Word files from email or downloads and keep Protected View enabled. This is general advice and has not been verified to block this flaw.
Exploitation
- No exploitation of this CVE is reported in the sources reviewed.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- No public proof of concept or exploit module was found.
Our recommendation
- Install the Microsoft Office security updates for all affected products as a priority, starting with users who open external documents.
- Check the Microsoft Security Update Guide for the exact fixed build of Microsoft 365 Apps for Enterprise.
- Verify the LTSC 2024 fixed version against Microsoft's advisory, as it is currently only confirmed by an aggregator.
- Monitor the NVD and CISA KEV entries, as the CVSS, CWE and exploitation status may still change.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE.org CNA record www.cve.org
- Microsoft Security Update Guide msrc.microsoft.com
- Strix CVE-2026-111308 www.strix.ai
- Qualys Patch Tuesday review November 2026 blog.qualys.com
- Tenable Patch Tuesday November 2026 www.tenable.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 10 Nov 2026, 23:08.
Original description (NVD)
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code 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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