Microsoft Office Excel: Information disclosure vulnerability
Summary
A flaw in Microsoft Office Excel, classified as code injection (CWE-94), allows an authorized attacker to disclose information. Microsoft describes the impact as information disclosure only, with no integrity or availability impact. Exploitation requires local access, low privileges and user interaction, for example by opening a manipulated file delivered by email or download.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the fixed build (see vendor advisory)
- 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 (listed by a secondary source, not yet confirmed by the vendor)
- 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
- Microsoft 365 Apps for Enterprise: Unknown; see https://aka.ms/OfficeSecurityReleases
- Microsoft Office 365 for Mac and LTSC for Mac: 16.115.26110837
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140 (unverified)
Workaround
Unknown.
Exploitation
- No public exploit code known.
- No known exploitation in the wild.
- Rapid7 rates exploitation as less likely.
- CISA SSVC: exploitation none, not automatable.
Our recommendation
- Install the November 2026 Office security update on all Microsoft 365 Apps, LTSC and Mac installations through the normal monthly cycle.
- Check the MSRC advisory for the exact fixed build and any mitigation text.
- Verify that LTSC 2024 builds are covered once the vendor confirms the fixed version.
- Monitor for new exploit reports and Microsoft updates to the CVE record.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- CVE.org CNA record www.cve.org
- MSRC Security Update Guide msrc.microsoft.com
- Microsoft Office security updates learn.microsoft.com
- Rapid7 November 2026 Patch Tuesday www.rapid7.com
- Strix CVE-2026-123395 (secondary) 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, 15:11.
Original description (NVD)
Improper control of generation of code ('code injection') in Microsoft Office Excel allows an authorized attacker to disclose information 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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.