CVE-2026-32201
Published 2026-04-14 · Updated 2026-10-26 · Source secure@microsoft.com
Summary
CVE-2026-32201 is a medium-severity (CVSS 6.5) vulnerability in Microsoft SharePoint Server. CISA added it to the Known Exploited Vulnerabilities catalog on April 14, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 28, 2026. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.
All 390 known-exploited Microsoft vulnerabilities →Description
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CISA Known-Exploited Vulnerability
Product: Microsoft — SharePoint Server
Name: Microsoft SharePoint Server Improper Input Validation Vulnerability
Date added: 2026-04-14 · Due: 2026-04-28
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.