# CVE-2026-109504: Microsoft Office SharePoint cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-109504-improper-neutralization-of-input-during-web-page-generation  
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-2026-109504 · Severity: high · CVSS 7.3 · Published 2026-11-10

Microsoft Office SharePoint is a collaboration and document management platform used across enterprises. An authenticated attacker can inject malicious scripts that execute in other users' browsers, potentially leading to account compromise, data theft, or unauthorized actions performed on behalf of victims.

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

## Quick answers

**Is CVE-2026-109504 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109504 being exploited in the wild.

**How severe is CVE-2026-109504?** High severity, with a CVSS score of 7.3, published 10 November 2026.

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

**Is there a fix for CVE-2026-109504?** 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-2026-109504 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-109504?** 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

This is a reflected or stored cross-site scripting (XSS) vulnerability in SharePoint's web page generation functionality that fails to properly neutralize user input. An authorized attacker can craft malicious input that bypasses sanitization, causing arbitrary JavaScript to execute in the context of other users' sessions over the network.

## Affected products

- Microsoft Office SharePoint

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109504](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109504)

## 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)