# CVE-2026-111289: Microsoft Office use after free allows remote code execution

Source: https://junglewise.ai/threats/cve-2026-111289-use-after-free-in-microsoft-office-allows-an-unauthorized  
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-2026-111289 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office is a suite of productivity applications used across organizations for document creation and editing. A use-after-free vulnerability allows an attacker to send a specially crafted document that, when opened, executes arbitrary code on the victim's computer. This could lead to complete system compromise, data theft, or malware installation.

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

## Quick answers

**Is CVE-2026-111289 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111289 being exploited in the wild.

**How severe is CVE-2026-111289?** High severity, with a CVSS score of 8.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-111289?** 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-2026-111289 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-111289?** Check whether you run Microsoft Office. 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 use-after-free memory corruption vulnerability exists in Microsoft Office that can be exploited via a malicious document delivered over the network. The vulnerability allows unauthenticated remote code execution when a user opens a crafted file, requiring user interaction to trigger the exploit.

## Affected products

- Microsoft Office

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111289](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111289)

## Related threats

- [Microsoft Office Outlook user warning spoofing vulnerability](https://junglewise.ai/threats/cve-2026-124194-microsoft-office-outlook-missing-user-interaction-for)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-122198-heap-based-buffer-overflow-in-microsoft-office-allows-an)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-120003-heap-based-buffer-overflow-in-microsoft-office-allows-an)
- [Microsoft Office UI security feature bypass](https://junglewise.ai/threats/cve-2026-119998-product-ui-does-not-warn-user-of-unsafe-actions-in-microsoft)
- [Microsoft Office heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-116717-heap-based-buffer-overflow-in-microsoft-office-allows-an)