Microsoft Office: Information disclosure through buffer over-read
Summary
A buffer over-read in Microsoft Office allows an unauthorized attacker to read memory contents and disclose information over a network. Exploitation requires that a user opens a crafted file or otherwise interacts with the attack, and the impact is limited to confidentiality. Microsoft rates the vulnerability at CVSS 6.5 (Medium), and no exploitation is known.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the build listed at https://aka.ms/OfficeSecurityReleases (exact build unknown)
- 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 and LTSC for Mac 2021/2024: only listed by a third-party source, not confirmed in the Microsoft record
Fixed in
- Office 365 for Mac: 16.115.26110837
- Office LTSC 2021: 16.0.14334.21048
- Microsoft 365 Apps for Enterprise: see https://aka.ms/OfficeSecurityReleases (build unknown)
- Office LTSC 2024 (16.0.17932.21140) and LTSC for Mac 2021/2024 (16.115.26110837): unconfirmed, verify with Microsoft
Workaround
Unknown. Microsoft recommends installing the security update.
Exploitation
- No exploitation in the wild known from the research performed.
- No public proof of concept found.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact partial.
- CISA KEV catalogue was not checked.
Our recommendation
- Install the Microsoft Office security update on all affected systems as part of the normal monthly patch cycle.
- Check first for perpetual LTSC 2021 and LTSC 2024 installations, which need manual or managed patching.
- Verify the fixed builds in the Microsoft Security Update Guide before rollout.
- Keep Microsoft 365 on a supported update channel.
- Use Protected View and file-block settings for files from the internet or email.
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 (Microsoft CNA) www.cve.org
- Microsoft Security Update Guide msrc.microsoft.com
- Microsoft 365 Apps security updates learn.microsoft.com
- VulDB entry vuldb.com
- Strix.ai CVE-2026-112731 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, 12:28.
Original description (NVD)
Buffer over-read in Microsoft Office 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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