Microsoft Word: Use-after-free vulnerability allowing code execution
Summary
A use-after-free vulnerability (CWE-416) in Microsoft Word, part of Microsoft 365 Apps and Office, allows an unauthorized attacker to execute code. According to the CVSS vector, the attack is local and requires user interaction, for example opening a malicious Word document received by email, download or file share. The CVSS 3.1 base score is 7.8 (High).
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the build listed on the Microsoft Office security release page
- Microsoft 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 (secondary source, not yet verified)
- Office LTSC for Mac 2021 and 2024: before 16.115.26110837
Fixed in
- Microsoft 365 Apps for Enterprise: Unknown (see MSRC advisory)
- Microsoft Office 365 for Mac: 16.115.26110837
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140 (secondary source, verify on MSRC)
- Office LTSC for Mac 2021 and 2024: 16.115.26110837
Workaround
Unknown.
Exploitation
- No exploitation known at the time of research.
- No public proof of concept found.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- CVSS exploit maturity: Unproven.
Our recommendation
- Confirm the fixed builds for each product on the MSRC advisory before rollout.
- Patch Microsoft 365 Apps, Office LTSC and Office for Mac in the November 2026 update cycle.
- Keep mail and document filtering in place for untrusted Word attachments.
- Check NVD and the CISA KEV catalog for changes in 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-2026-113759 msrc.microsoft.com
- CVE Record CVE-2026-113759 www.cve.org
- Strix: CVE-2026-113759 www.strix.ai
- Cybersecurity News: Microsoft November 2026 Patch Tuesday cybersecuritynews.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, 04:12.
Original description (NVD)
Use after free in Microsoft Office Word allows an unauthorized attacker to execute code 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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