# CVE-2026-69778: Microsoft Office Access heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69778-microsoft-office-access-heap-based-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69778 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Office Access is a database management application used by organizations to store and manage business data. A heap-based buffer overflow vulnerability allows an attacker to execute arbitrary code on a user's computer through a malicious file sent over a network, potentially compromising sensitive business data and system integrity.

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

## Quick answers

**Is CVE-2026-69778 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69778 being exploited in the wild.

**How severe is CVE-2026-69778?** High severity, with a CVSS score of 8.8, published 8 September 2026.

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

**Is there a fix for CVE-2026-69778?** 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-2026-69778 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-69778?** 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 vulnerability exists in Microsoft Office Access's file parsing logic. The vulnerability is triggered when processing specially crafted Access database files, allowing an attacker to overflow heap memory and gain control of program execution. The attack requires user interaction (opening a malicious file), but can be delivered remotely via email or web download. Successful exploitation enables arbitrary code execution with the privileges of the user running Access. Microsoft has released security updates addressing this vulnerability.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69778](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69778)

## Related threats

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