CVE-2026-32201

Microsoft SharePoint Server: Improper Input Validation

As of , CVE-2026-32201 in Microsoft SharePoint Server is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 14 April 2026
US federal deadline
28 April 202614 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.43Higher than 98% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: msrc.microsoft.comLinks below, from CISA's entry.

What CISA says to do

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA's required action

What the flaw is

Microsoft SharePoint Server contains an improper input validation vulnerability that allows an unauthorized attacker to perform spoofing over a network.

CISA's description

Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

The CVE record's description, from microsoft

CVE published
14 April 2026
Assigned by
microsoft
CVSS
6.5 Medium (CVSS 3.1, from the CNA)
CWE-20
Improper Input Validation
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
partial

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

SharePoint Server: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2026-45659Deserialization of Untrusted DataMicrosoft SharePoint ServerPatch nowForensic triage required by CISA; ransomware use, listed within a year0.03
CVE-2026-56164Missing Authentication for Critical FunctionMicrosoft SharePoint ServerPatch nowForensic triage required by CISA0.01
CVE-2023-24955Code InjectionMicrosoft SharePoint ServerPatch this weekRansomware use; Metasploit module; EPSS 0.850.85
CVE-2023-29357Privilege EscalationMicrosoft SharePoint ServerPatch this weekRansomware use; Metasploit module; EPSS 0.990.99

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