Quick answers
- Is CVE-2026-45479 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-45479 being exploited in the wild.
- How severe is CVE-2026-45479?
- Medium severity, with a CVSS score of 4.6, published 9 June 2026.
- Which products and versions are affected?
- Microsoft Office SharePoint.
- Is there a fix for CVE-2026-45479?
- 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-2026-45479 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-45479?
- Check whether you run Microsoft 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 or reflected cross-site scripting (XSS) vulnerability exists in Microsoft Office SharePoint due to improper neutralization of user-supplied input during web page generation. An attacker with low-level authenticated permissions (PR:L) can exploit this over the network by injecting malicious scripts. Successful exploitation requires a legitimate user to interact with a crafted link or page (UI:R). This allows the attacker to execute arbitrary script code in the context of the victim's browser session, potentially leading to session hijacking or unauthorized data disclosure. Microsoft has released security updates to address this issue via the MSRC update guide.
Affected products
- Microsoft Office SharePoint
Timeline
- 2026-06-09: advisory: Initial disclosure by Microsoft and NVD.