Quick answers
- Is CVE-2026-102859 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-102859 being exploited in the wild.
- How severe is CVE-2026-102859?
- 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-2026-102859?
- 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-2026-102859 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-102859?
- 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 stored cross-site scripting (XSS) vulnerability in Microsoft Office SharePoint that fails to properly sanitize user input during web page generation. An authenticated attacker can inject arbitrary JavaScript code that executes in the browsers of other users who view the affected pages, enabling spoofing or session hijacking attacks.
Affected products
- Microsoft Office SharePoint
Timeline
- 2026-10-13: disclosed