# CVE-2026-109493: Microsoft Office Access heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-109493-heap-based-buffer-overflow-in-microsoft-office-access-allows-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-109493 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office Access, a database management application widely used for business data storage and reporting, contains a heap buffer overflow vulnerability that allows attackers to execute arbitrary code remotely. An attacker can exploit this flaw by sending a specially crafted file or network request, potentially leading to complete system compromise including data theft and malware installation.

Technologies: [Microsoft Office Access](https://junglewise.ai/threats/technologies/office-access). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-109493 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109493 being exploited in the wild.

**How severe is CVE-2026-109493?** High severity, with a CVSS score of 8.8, published 10 November 2026.

**Which products and versions are affected?** Microsoft Office Access.

**Is there a fix for CVE-2026-109493?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-109493 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109493?** Check whether you run Microsoft Office Access. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in Microsoft Office Access that can be exploited over the network to achieve remote code execution. The vulnerability allows an attacker to execute arbitrary code in the context of the Access process without requiring prior authentication or user interaction. A fix is available from Microsoft.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109493](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109493)

## Related threats

- [Microsoft Office Access heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-111305-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)
- [Microsoft Office Access heap buffer overflow](https://junglewise.ai/threats/cve-2026-111301-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)
- [Microsoft Office Access heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-110060-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)
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- [Microsoft Office Access heap buffer overflow](https://junglewise.ai/threats/cve-2026-110058-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)