# CVE-2026-111305: Microsoft Office Access heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-111305-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-2026-111305 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office Access, a database management application used in business environments, contains a heap-based buffer overflow vulnerability that could allow an attacker to execute arbitrary code on a user's computer. An attacker could exploit this by sending a malicious file over the network, potentially gaining control of the system and accessing sensitive data stored in the database.

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

## Quick answers

**Is CVE-2026-111305 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111305 being exploited in the wild.

**How severe is CVE-2026-111305?** 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-2026-111305?** 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-2026-111305 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-111305?** 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 permits remote code execution over the network. The vulnerability allows an attacker to overflow a heap buffer and execute arbitrary code with the privileges of the user running Access. No authentication is required; exploitation only requires sending a specially crafted file to the target.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111305](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111305)

## Related threats

- [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)
- [Microsoft Office Access heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-110059-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)
- [Microsoft Office Access heap buffer overflow](https://junglewise.ai/threats/cve-2026-110058-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)
- [Microsoft Office Access heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-109498-heap-based-buffer-overflow-in-microsoft-office-access-allows-an)