Microsoft Office Access: Heap-based buffer overflow enabling code execution
Summary
A heap-based buffer overflow in Microsoft Office Access allows an unauthorized attacker to execute code over a network. The CVSS score is 8.8 (CVSS 3.1, high). User interaction is required, so an attacker would typically need a user to open or work with crafted content; this is inferred from the vector, and no delivery method is documented. Affected are Microsoft 365 Apps for Enterprise and Office LTSC 2021 and 2024 builds below the fixed versions.
Affected
- Microsoft 365 Apps for Enterprise: 16.0.1 before the build listed at https://aka.ms/OfficeSecurityReleases
- Office LTSC 2021: 16.0.1 before 16.0.14334.21048
- Office LTSC 2024: 16.0.0 before 16.0.17932.21140
- Office 2016, Office 2019 and other editions: Unknown.
Fixed in
- Microsoft 365 Apps for Enterprise: Fixed build unknown; see https://aka.ms/OfficeSecurityReleases
- Office LTSC 2021: 16.0.14334.21048
- Office LTSC 2024: 16.0.17932.21140
- Published with the November 2026 Patch Tuesday release.
Workaround
- Unknown. No workaround is documented in the sources reviewed. Applying the security update is the practical fix.
Exploitation
- Not listed as exploited in the sources reviewed (Strix tracker: KEV No). No CISA KEV entry found.
- CISA SSVC: Exploitation none, Automatable no, Technical Impact total.
- Public proof of concept: Unknown.
Our recommendation
- Patch Microsoft 365 Apps and Office LTSC clients to the current builds from the MSRC advisory and the aka.ms link.
- Check whether Office 2016 or Office 2019 is in use and verify their status with MSRC.
- Block or restrict Access attachments in mail gateways if your business does not need them.
- Warn users about unsolicited Access files and monitor for suspicious Office process activity.
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 Response Center advisory CVE-2026-110058 msrc.microsoft.com
- CVE Record CVE-2026-110058 www.cve.org
- Strix tracker CVE-2026-110058 www.strix.ai
- BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.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, 23:44.
Original description (NVD)
Heap-based buffer overflow in Microsoft Office Access 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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