Is CVE-2026-109456 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-109456 being exploited in the wild.

How severe is CVE-2026-109456?

Medium severity, with a CVSS score of 4.6, published 10 November 2026.

Is there a fix for CVE-2026-109456?

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-2026-109456 attacked?

It is attacked over the network.

Am I affected by CVE-2026-109456?

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.

CVE-2026-109456: Microsoft Office SharePoint cross-site scripting

CVE-2026-109456 · Severity: medium · CVSS 4.6 · Published 2026-11-10

Microsoft Office SharePoint is a collaboration platform used to store and manage business documents and data. An authorized user can inject malicious code that executes in other users' browsers, potentially stealing credentials, data, or impersonating the attacker as a trusted administrator to trick colleagues into revealing sensitive information.

Technologies: Microsoft Office SharePoint. Vendors: Microsoft.

Quick answers

Is CVE-2026-109456 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-109456 being exploited in the wild.
How severe is CVE-2026-109456?: Medium severity, with a CVSS score of 4.6, published 10 November 2026.
Which products and versions are affected?: Microsoft Office SharePoint.
Is there a fix for CVE-2026-109456?: 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-2026-109456 attacked?: It is attacked over the network.
Am I affected by CVE-2026-109456?: 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 that fails to sanitize user input. An authenticated attacker can craft a malicious request or content that causes arbitrary JavaScript to execute in a victim's browser session, compromising the confidentiality and integrity of user interactions with the platform.

Affected products

Microsoft Office SharePoint

Timeline

2026-11-10: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109456

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