# CVE-2026-111309: Microsoft Office Outlook invalid pointer dereference remote code execution

Source: https://junglewise.ai/threats/cve-2026-111309-release-of-invalid-pointer-or-reference-in-microsoft-office  
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-2026-111309 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office Outlook, an email and calendar application used across enterprises, contains a flaw in how it manages memory pointers that could allow an attacker to execute arbitrary code on a user's computer over the network. This could lead to full system compromise, data theft, or installation of malware without user action.

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

## Quick answers

**Is CVE-2026-111309 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-111309 being exploited in the wild.

**How severe is CVE-2026-111309?** High severity, with a CVSS score of 8.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-111309?** 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-2026-111309 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-111309?** Check whether you run Microsoft Office Outlook. 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 or invalid pointer dereference vulnerability in Microsoft Office Outlook allows remote code execution via network attack vector. The vulnerability requires network connectivity but does not explicitly require user interaction or prior authentication; a crafted message or connection could trigger the memory safety issue and execute attacker code with Outlook's privileges.

## Affected products

- Microsoft Office Outlook

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111309](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111309)

## Related threats

- [Microsoft Office Outlook path traversal in pathname handling](https://junglewise.ai/threats/cve-2026-124228-improper-limitation-of-a-pathname-to-a-restricted-directory-path)
- [Microsoft Office Outlook use of uninitialized resource code execution](https://junglewise.ai/threats/cve-2026-124227-use-of-uninitialized-resource-in-microsoft-office-outlook-allows)
- [Microsoft Office Outlook user warning spoofing vulnerability](https://junglewise.ai/threats/cve-2026-124194-microsoft-office-outlook-missing-user-interaction-for)
- [Microsoft Office Outlook heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-123383-heap-based-buffer-overflow-in-microsoft-office-outlook-allows-an)
- [Microsoft Office Outlook untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-123382-untrusted-pointer-dereference-in-microsoft-office-outlook-allows)