# CVE-2026-69477: Microsoft Office Access heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69477-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-2026-69477 · Severity: high · CVSS 7.3 · Published 2026-09-08

Microsoft Office Access is a database management application used by many organizations to store and manage business data. A heap-based buffer overflow vulnerability allows an authorized user with local access to execute arbitrary code on the affected system, potentially compromising data confidentiality 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-2026-69477 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69477 being exploited in the wild.

**How severe is CVE-2026-69477?** High severity, with a CVSS score of 7.3, published 8 September 2026.

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

**Is there a fix for CVE-2026-69477?** 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-2026-69477 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-69477?** 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 due to improper bounds checking in a memory operation. The vulnerability requires an authorized user with local access to trigger the overflow, likely by opening a specially crafted Access file. Successful exploitation allows execution of arbitrary code with the privileges of the user running Access. Microsoft has released security patches to address this issue.

## Affected products

- Microsoft Office Access

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69477](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69477)

## 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)