Microsoft Office Word: Heap-based buffer overflow allows remote code execution
Summary
Microsoft Office Word contains a heap-based buffer overflow that allows an unauthorized attacker to execute code over a network. The attacker needs a user to open a crafted document, typically delivered by email or download, and the code then runs with the rights of the logged-in user. The CVSS base score is 8.8 (High), and no privileges are required for the attack.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the fixed build listed in the Microsoft advisory
- Office 365 for Mac: 1.0.0 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: 16.0.1 before 16.115.26110837
- Office LTSC for Mac 2024: 16.0.0 before 16.115.26110837
Fixed in
- Office LTSC 2021: 16.0.14334.21048 or later
- Office LTSC 2024: 16.0.17932.21140 or later
- Office 365 for Mac and Office LTSC for Mac: 16.115.26110837 or later
- Microsoft 365 Apps for Enterprise: Unknown; see the Microsoft advisory for the fixed build
- Released with the Microsoft update of November 10, 2026
Workaround
Unknown. No vendor mitigation was found; patching is the primary fix.
Exploitation
- No known exploitation in the wild at the time of research
- No public proof-of-concept code known
- CISA SSVC: exploitation none, automatable no, technical impact total
Our recommendation
- Update all affected Office installations to the fixed builds, starting with internet-facing or mail-connected systems
- Verify the installed build on each endpoint against the Microsoft advisory before reporting it as patched
- Keep Protected View enabled and block or quarantine unsolicited Word attachments at the mail gateway
- Monitor the Microsoft advisory and CISA KEV for changes in exploitation status
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-2026-112724 msrc.microsoft.com
- CVE Record: CVE-2026-112724 www.cve.org
- Cryptika: Microsoft November 2026 Patch Tuesday coverage www.cryptika.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, 22:55.
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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