What is CVE-2026-47634?

CVE-2026-47634 is a high-severity vulnerability in Microsoft Sharepoint Server 2019, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-06-09.

How severe is CVE-2026-47634?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Microsoft Sharepoint Server 2019

CVE-2026-47634

Improper neutralization of special elements in output used by a downstream component ('injection') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.

EPSS: 0.006 (43.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

Affected products

Microsoft Sharepoint Server 2019 — versions 16.0.0
Microsoft Sharepoint Server Subscription Edition — versions 16.0.0
Microsoft Sharepoint_server — versions 2019

Weakness classification (CWE)

References

secure@microsoft.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-47634?: CVE-2026-47634 is a high-severity vulnerability in Microsoft Sharepoint Server 2019, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.3/10. Published 2026-06-09.
How severe is CVE-2026-47634?: High severity. CVSS v3 base score is 7.3 out of 10.