# CVE-2026-45464: Microsoft Office SharePoint cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-45464-microsoft-office-sharepoint-cross-site-scripting  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-09. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

CVE-2026-45464 · Severity: medium · CVSS 5.4 · Published 2026-06-09

Microsoft Office SharePoint, a widely used collaboration and document management platform, contains 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 user's browser session. This could lead to the theft of sensitive information or unauthorized actions performed on behalf of the user within the SharePoint environment.

Technologies: [Microsoft SharePoint](https://junglewise.ai/threats/technologies/sharepoint). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-45464 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-45464 being exploited in the wild.

**How severe is CVE-2026-45464?** 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-2026-45464?** 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-2026-45464 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-45464?** 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). The vulnerability allows a remote attacker to perform spoofing over a network. According to the CVSS vector, the attack requires user interaction (UI:R) but no prior privileges (PR:N). An attacker who successfully exploits this vulnerability could execute arbitrary script code in the context of the victim's browser, potentially leading to session hijacking or unauthorized data access. Microsoft has released information regarding this vulnerability in their Security Update Guide.

## Affected products

- Microsoft Office SharePoint

## Timeline

- 2026-06-09: disclosed: Initial publication of the CVE record and Microsoft advisory.

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45464](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45464)

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