# CVE-2026-120000: Microsoft SharePoint deserialization code execution

Source: https://junglewise.ai/threats/cve-2026-120000-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-2026-120000 · Severity: high · CVSS 7.5 · Published 2026-11-10

Microsoft SharePoint is a collaboration platform that stores and manages corporate documents and communications. A flaw in how it processes serialized data allows an authenticated attacker to run arbitrary code on the server, potentially compromising all data stored in SharePoint and enabling lateral movement within the organization.

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

## Quick answers

**Is CVE-2026-120000 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120000 being exploited in the wild.

**How severe is CVE-2026-120000?** High severity, with a CVSS score of 7.5, published 10 November 2026.

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

**Is there a fix for CVE-2026-120000?** 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-2026-120000 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-120000?** Check whether you run Microsoft 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 is a deserialization of untrusted data flaw in Microsoft Office SharePoint that permits remote code execution. An authorized attacker (requiring valid credentials) can exploit this over the network to execute arbitrary code with SharePoint server privileges.

## Affected products

- Microsoft SharePoint

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120000](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-120000)

## Related threats

- [Microsoft SharePoint incorrect authorization privilege escalation](https://junglewise.ai/threats/cve-2026-102862-incorrect-authorization-in-microsoft-office-sharepoint-allows-an)
- [Microsoft SharePoint time-of-check time-of-use race condition](https://junglewise.ai/threats/cve-2026-69804-microsoft-sharepoint-time-of-check-time-of-use-race-condition)
- [Microsoft SharePoint missing authorization in code execution](https://junglewise.ai/threats/cve-2026-69724-microsoft-sharepoint-missing-authorization-in-code-execution)
- [Microsoft SharePoint code injection](https://junglewise.ai/threats/cve-2026-65660-microsoft-sharepoint-code-injection)
- [Microsoft SharePoint weak authentication security feature bypass](https://junglewise.ai/threats/cve-2026-55040-microsoft-sharepoint-weak-authentication-security-feature-bypass)