# CVE-2026-109472: Microsoft Office SharePoint deserialization of untrusted data

Source: https://junglewise.ai/threats/cve-2026-109472-deserialization-of-untrusted-data-in-microsoft-office-sharepoint  
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-2026-109472 · Severity: high · CVSS 8.8 · Published 2026-11-10

Microsoft Office SharePoint, a collaboration platform used to store and manage documents, contains a flaw in how it processes untrusted data. An attacker with authorized access could exploit this to execute arbitrary code on the affected server, potentially compromising all data stored in SharePoint and enabling lateral movement within the network.

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

## Quick answers

**Is CVE-2026-109472 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109472 being exploited in the wild.

**How severe is CVE-2026-109472?** High severity, with a CVSS score of 8.8, published 10 November 2026.

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

**Is there a fix for CVE-2026-109472?** 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-2026-109472 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-109472?** Check whether you run Microsoft Office SharePoint. 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

The vulnerability exists in SharePoint's deserialization logic, which processes untrusted input without proper validation. An authenticated attacker can send a crafted request over the network to trigger unsafe deserialization and achieve remote code execution. This requires valid credentials but does not require user interaction.

## Affected products

- Microsoft Office SharePoint

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109472](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109472)

## Related threats

- [Microsoft Office SharePoint privilege escalation via missing authorization](https://junglewise.ai/threats/cve-2026-88176-missing-authorization-in-microsoft-office-sharepoint-allows-an)
- [Microsoft Office SharePoint XSS privilege escalation](https://junglewise.ai/threats/cve-2026-80095-improper-neutralization-of-input-during-web-page-generation-cross)
- [Microsoft Office SharePoint server-side request forgery](https://junglewise.ai/threats/cve-2026-124210-server-side-request-forgery-ssrf-in-microsoft-office-sharepoint)
- [Microsoft Office SharePoint privilege escalation via incorrect authorization](https://junglewise.ai/threats/cve-2026-123391-incorrect-authorization-in-microsoft-office-sharepoint-allows-an)
- [Microsoft Office SharePoint deserialization of untrusted data](https://junglewise.ai/threats/cve-2026-123390-deserialization-of-untrusted-data-in-microsoft-office-sharepoint)