# CVE-2026-69360: Microsoft Office Word heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-69360-microsoft-office-word-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-2026-69360 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Office Word is a widely-used word processing application used by organizations for document creation and editing. A heap-based buffer overflow vulnerability could allow an attacker to execute arbitrary code on a user's computer, potentially compromising sensitive documents, enabling data theft, or establishing a foothold for further attacks on corporate networks.

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

## Quick answers

**Is CVE-2026-69360 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69360 being exploited in the wild.

**How severe is CVE-2026-69360?** High severity, with a CVSS score of 8.8, published 8 September 2026.

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

**Is there a fix for CVE-2026-69360?** 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-2026-69360 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-69360?** Check whether you run Microsoft Office Word. 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 Word, allowing remote code execution when a user opens a maliciously crafted document. The vulnerability stems from improper bounds checking in memory allocation, enabling an attacker to overwrite heap memory and execute arbitrary code. The attack requires user interaction (opening a document) but does not require authentication. An attacker can achieve code execution with the privileges of the user running Word, potentially compromising the system and accessing sensitive data. Patches are expected to be available via Microsoft's regular security update channels.

## Affected products

- Microsoft Office Word

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69360](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69360)

## Related threats

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- [Microsoft Office Word use of uninitialized resource](https://junglewise.ai/threats/cve-2026-124185-use-of-uninitialized-resource-in-microsoft-office-word-allows-an)
- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-123394-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)
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- [Microsoft Office Word heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-116923-heap-based-buffer-overflow-in-microsoft-office-word-allows-an)