CVE-2026-45465: Microsoft Office SharePoint cross-site scripting

CVE-2026-45465 · Severity: medium · CVSS 5.4 · Published 2026-06-09

Microsoft Office SharePoint, a widely used collaboration and document management platform, is affected by a security vulnerability that could allow an attacker to perform spoofing. By tricking a user into interacting with a malicious link or page, an attacker can execute unauthorized scripts in the context of the user's session. This could lead to unauthorized access to sensitive documents, data theft, or the performance of actions on behalf of the compromised user.

Technologies: Microsoft SharePoint. Vendors: Microsoft.

Quick answers

Is CVE-2026-45465 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-45465 being exploited in the wild.
How severe is CVE-2026-45465?
Medium severity, with a CVSS score of 5.4, published 9 June 2026.
Which products and versions are affected?
Microsoft Office SharePoint.
Is there a fix for CVE-2026-45465?
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-2026-45465 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-45465?
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 cross-site scripting (XSS) vulnerability exists in Microsoft Office SharePoint due to improper neutralization of input during web page generation (CWE-79). An attacker can exploit this by sending a specially crafted request to a vulnerable SharePoint instance. While the advisory mentions an 'authorized attacker' in the description, the CVSS vector (PR:N) suggests that no special privileges are required, though user interaction (UI:R) is necessary. Successful exploitation allows the attacker to execute arbitrary script code in the victim's browser session, potentially leading to information disclosure or session hijacking. Microsoft has released security updates to address this issue.

Affected products

  • Microsoft Office SharePoint

Timeline

  • 2026-06-09: disclosed
  • 2026-06-09: advisory

References

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