Is CVE-2026-105593 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-105593 being exploited in the wild.

How severe is CVE-2026-105593?

High severity, with a CVSS score of 8.8, published 13 October 2026.

Is there a fix for CVE-2026-105593?

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-2026-105593 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-105593?

Check whether you run Microsoft 365 Apps, Microsoft Office 2021, Microsoft Office 2024 or one of the others listed. 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.

CVE-2026-105593: Microsoft Office Access heap buffer overflow

CVE-2026-105593 · Severity: high · CVSS 8.8 · Published 2026-10-13

Microsoft Office Access, a database management application widely used in enterprise environments, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code on a victim's computer over a network. Exploitation requires no user authentication and could lead to complete system compromise, data theft, or lateral movement within an organization.

Technologies: Microsoft 365 Apps, Microsoft Office 2021, Microsoft Office 2024, Microsoft Office Access. Vendors: Microsoft.

Quick answers

Is CVE-2026-105593 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-105593 being exploited in the wild.
How severe is CVE-2026-105593?: High severity, with a CVSS score of 8.8, published 13 October 2026.
Which products and versions are affected?: Microsoft Office Access.
Is there a fix for CVE-2026-105593?: 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-2026-105593 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-105593?: Check whether you run Microsoft 365 Apps, Microsoft Office 2021, Microsoft Office 2024 or one of the others listed. 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 can be triggered remotely without user interaction or authentication, allowing an attacker to execute arbitrary code with the privileges of the user running Access. The vulnerability affects the core database processing functionality and is triggered through maliciously crafted input. A patch has been released by Microsoft.

Affected products

Microsoft Office Access

Timeline

2026-10-13: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105593

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