# CVE-2026-111301: Microsoft Office Access heap buffer overflow

Source: https://junglewise.ai/threats/cve-2026-111301-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-2026-111301 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office Access, a database management tool used by businesses to store and manage data, contains a memory safety vulnerability that allows an attacker to run malicious code on a victim's computer over the network without authentication. This could lead to complete compromise of a system, including data theft, system corruption, or deployment of ransomware.

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

## Quick answers

**Is CVE-2026-111301 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111301 being exploited in the wild.

**How severe is CVE-2026-111301?** 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-2026-111301?** 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-2026-111301 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-111301?** 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 in Microsoft Office Access allows remote code execution over the network without requiring user authentication or interaction. The vulnerability resides in the core file handling or data processing component of Access. Successful exploitation grants an attacker arbitrary code execution in the context of the affected process.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111301](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111301)

## 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-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)