Microsoft Office Word: Heap-based buffer overflow enables code execution
Summary
A heap-based buffer overflow in Microsoft Office Word allows an unauthenticated attacker to execute code over a network. Exploitation requires that a user opens or previews a crafted Word document, most likely delivered by email or file share. The CVSS base score is 8.8 and NVD analysis was still pending at the time of writing.
Affected
- Microsoft 365 Apps for Enterprise (16.0.1 up to the build in the Microsoft release page; exact version unknown)
- Microsoft Office 365 for Mac: 1.0.0 to before 16.115.26110837
- Microsoft Office LTSC 2021: 16.0.1 to before 16.0.14334.21048
- Not verified: Microsoft Office LTSC 2024 (before 16.0.17932.21140) and LTSC for Mac 2021/2024 (before 16.115.26110837), listed by a third-party aggregator only
Fixed in
- Microsoft Office LTSC 2021: 16.0.14334.21048 or later
- Microsoft Office 365 for Mac: 16.115.26110837 or later
- Microsoft 365 Apps for Enterprise: Unknown, see the MSRC Security Update Guide
- Office LTSC 2024 and LTSC for Mac editions: Unknown, not verified
Workaround
No workaround or mitigation known.
Exploitation
- No evidence of in-the-wild exploitation.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- The CVSS temporal vector (E:U) indicates no known exploit code at publication.
- No public proof of concept found.
Our recommendation
- Check the installed Office build on all endpoints and compare it with the fixed versions above.
- Deploy the November 2026 Office updates with priority, starting with Microsoft 365 Apps and LTSC 2021.
- Verify the fixed build for Microsoft 365 Apps and the unverified products in the MSRC Security Update Guide before rollout.
- Keep Protected View enabled and restrict handling of macros and attachments from the internet.
- Monitor for exploitation and re-check the status within days, as this is a fresh disclosure.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE Record CVE-2026-112714 www.cve.org
- Microsoft Security Update Guide CVE-2026-112714 msrc.microsoft.com
- Strix CVE-2026-112714 (aggregator, unverified products) 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 10 Nov 2026, 23:04.
Original description (NVD)
Heap-based buffer overflow 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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