# CVE-2026-47640: Microsoft Office SharePoint cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-47640-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-2026-47640 · Severity: medium · CVSS 4.6 · Published 2026-06-09

Microsoft Office SharePoint, a widely used collaboration and document management platform, is affected by a security vulnerability that allows for cross-site scripting. An authenticated attacker could use this flaw to perform spoofing attacks against other users on the network. This could lead to unauthorized actions being performed in the context of a victim's session or the theft of sensitive information through malicious web content.

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

## Quick answers

**Is CVE-2026-47640 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-47640 being exploited in the wild.

**How severe is CVE-2026-47640?** 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-2026-47640?** 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-2026-47640 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-47640?** 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 with basic user permissions (PR:L) can exploit this over the network by injecting malicious scripts into SharePoint pages. Execution of the exploit requires a victim to interact with the affected page (UI:R). Successful exploitation allows the attacker to perform spoofing, potentially leading to session hijacking or unauthorized data access within the scope of the user's browser session. Microsoft has released security updates to address this issue.

## Affected products

- Microsoft Office SharePoint

## Timeline

- 2026-06-09: advisory: Microsoft published the security advisory.
- 2026-06-09: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47640](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47640)

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