Microsoft Office Word: Information disclosure through incorrect numeric type conversion
Summary
A flaw in Microsoft Office Word caused by an incorrect conversion between numeric types allows an unauthorized attacker to disclose information over a network. Microsoft describes the impact as the potential reading of small portions of heap memory. The attacker needs a user to open a crafted Word document, for example one received by email or file sharing, and the confidentiality impact is limited to information disclosure.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the fixed build stated on https://aka.ms/OfficeSecurityReleases (fixed build unknown)
- Office for Mac 365: before 16.115.26110837
- Office LTSC 2021: 16.0.1 before 16.0.14334.21048
- Office LTSC 2024: 16.0.0 before 16.0.17932.21140
- Office LTSC for Mac 2021: before 16.115.26110837
- Office LTSC for Mac 2024: before 16.115.26110837
Fixed in
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140 (listed by Strix.ai, not yet confirmed by Microsoft or CVE.org)
- Office for Mac 365 and LTSC for Mac 2021/2024: 16.115.26110837
- Microsoft 365 Apps for Enterprise: Unknown.
Workaround
Unknown. No documented workaround is available; the fix is the security update.
Exploitation
- No known exploitation in the wild.
- Not publicly disclosed; no public proof of concept known.
- Not listed in KEV; no vendor-confirmed exploitation.
- Rapid7 rates exploitation as less likely.
- CISA SSVC: exploitation none, not automatable.
Our recommendation
- Install the November 2026 Microsoft Office security updates on all affected builds as part of the regular update cycle.
- Keep Protected View enabled for files from the internet or email.
- Filter or sandbox untrusted Word attachments.
- Verify the fixed build for Microsoft 365 Apps on the Microsoft security release page.
- Priority: moderate, as the flaw is not exploited.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-110051 msrc.microsoft.com
- CVE.org record CVE-2026-110051 www.cve.org
- Microsoft 365 Apps security updates learn.microsoft.com
- Rapid7 Patch Tuesday November 2026 www.rapid7.com
- Strix.ai CVE-2026-110051 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, 12:34.
Original description (NVD)
Incorrect conversion between numeric types in Microsoft Office Word allows an unauthorized attacker to disclose information 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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