CVE-2026-32201
Microsoft SharePoint Server Improper Input Validation Vulnerability
Microsoft SharePoint Server
Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 14 April 2026. US federal agencies were required to remediate it by 28 April 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 43.4%, which is higher than 98.7% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Frequently asked questions
Is CVE-2026-32201 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-32201.
What does CVE-2026-32201 affect?
CVE-2026-32201 affects Microsoft SharePoint Server. Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2026-32201?
CVE-2026-32201 is rated MEDIUM with a CVSS base score of 6.5. EPSS puts the probability of exploitation in the next 30 days at 43.4%, higher than 98.7% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 28 April 2026.
How should organisations respond to CVE-2026-32201?
Apply the vendor patch for Microsoft SharePoint Server as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.