Microsoft Office Word: Information disclosure via out-of-bounds read
Summary
A out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network. Exploitation requires a user to open or preview a crafted Word file, for example one received by email or download. Microsoft rates the flaw as Important, and CVSS scores the impact as high confidentiality with no integrity or availability impact.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 to before the fixed build listed at https://aka.ms/OfficeSecurityReleases
- Office 365 for Mac: 1.0.0 to before 16.115.26110837
- Office LTSC 2021: 16.0.1 to before 16.0.14334.21048
- Office LTSC 2024: 16.0.0 to before 16.0.17932.21140
- Office LTSC for Mac 2021: 16.0.1 to before 16.115.26110837
- Office LTSC for Mac 2024: 16.0.0 to before 16.115.26110837
Fixed in
- Office 365 for Mac: 16.115.26110837
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140
- Office LTSC for Mac 2021 and 2024: 16.115.26110837
- Microsoft 365 Apps for Enterprise: Unknown. The fixed build is listed at https://aka.ms/OfficeSecurityReleases and must be checked there.
Workaround
Unknown. No vendor-published workaround has been identified. Applying the security update is the remedy.
Exploitation
- Microsoft states that no publicly available exploit code exists or that exploitation is only theoretical.
- Microsoft's advisory is described as naming the Preview Pane as an attack vector.
- CISA SSVC: exploitation none, not automatable, partial technical impact.
- Rapid7 rates exploitation as Less Likely and reports no exploitation detected.
- No reports of exploitation in the wild were found.
Our recommendation
- Install the November 2026 Office security updates on all endpoints, including Mac and LTSC installations, and verify the installed build.
- Make sure Office updates install automatically.
- Keep Protected View and macro restrictions enabled.
- Consider restricting Outlook Preview Pane for documents where it is enabled.
- Prioritise patching for users who regularly open documents from email or the internet.
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-2026-111288 msrc.microsoft.com
- CVE Record CVE-2026-111288 www.cve.org
- Microsoft 365 Apps security updates learn.microsoft.com
- Rapid7: Patch Tuesday November 2026 www.rapid7.com
- CVE List V5 release 2026-11-10 github.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, 12:32.
Original description (NVD)
Out-of-bounds read 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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