# CVE-2026-102864: Microsoft Office SharePoint reflected cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-102864-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-102864 · Severity: medium · CVSS 4.6 · Published 2026-10-13

Microsoft Office SharePoint is a web-based collaboration and document management platform used by organizations. A flaw allows an authenticated attacker to inject malicious scripts that execute in users' browsers, enabling account spoofing, credential theft, or unauthorized actions performed on behalf of the victim.

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

## Quick answers

**Is CVE-2026-102864 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-102864 being exploited in the wild.

**How severe is CVE-2026-102864?** Medium severity, with a CVSS score of 4.6, published 13 October 2026.

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

**Is there a fix for CVE-2026-102864?** 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-2026-102864 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-102864?** Check whether you run Microsoft Office SharePoint or Microsoft SharePoint Server. 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

This is a reflected XSS vulnerability in SharePoint's web page generation that fails to properly neutralize user-controlled input. An authorized attacker can craft a malicious link containing script code that executes in the context of another user's browser session when they visit it, requiring the victim to interact with a social-engineered link. Successful exploitation allows spoofing and potential session hijacking.

## Affected products

- Microsoft Office SharePoint

## Timeline

- 2026-10-13: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102864](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102864)

## 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)