Quick answers
- Is CVE-2026-109454 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-109454 being exploited in the wild.
- How severe is CVE-2026-109454?
- Critical severity, with a CVSS score of 9, published 10 November 2026.
- Which products and versions are affected?
- Microsoft Office SharePoint.
- Is there a fix for CVE-2026-109454?
- 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-2026-109454 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-109454?
- 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
A stored cross-site scripting (XSS) vulnerability in Microsoft Office SharePoint's web page generation fails to properly neutralize user-supplied input, allowing an authenticated attacker to inject and execute arbitrary JavaScript. The vulnerability requires an authorized user with content creation or editing privileges and affects the SharePoint web interface. Successful exploitation enables session hijacking, credential harvesting, or lateral movement within the organization.
Affected products
- Microsoft Office SharePoint
Timeline
- 2026-11-10: disclosed