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Exploited vulnerability · CISA KEV

Is CVE-2026-32201 exploited? Yes: in CISA KEV since 14 Apr 2026

Gociux · Microsoft SharePoint Server · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-32201, Microsoft SharePoint Server Improper Input Validation Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 14 Apr 2026, the day it was published. It affects Microsoft SharePoint Server. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 14 Apr 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity6.5CVSS 3.1 · medium
US federal due28 Apr 2026BOD 22-01 deadline

What it is

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

VendorMicrosoft (391 exploited CVEs in KEV)
ProductSharePoint Server
VulnerabilityMicrosoft SharePoint Server Improper Input Validation Vulnerability
WeaknessCWE-20
Published14 Apr 2026
Added to KEV14 Apr 2026
Reported by (CNA)microsoft

What to do

  1. Check whether you run it. Look for SharePoint Server in your asset inventory, including appliances and cloud images. Stack check lists every exploited Microsoft CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 14 Apr 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Microsoft.

Other exploited CVEs in SharePoint Server

References

Questions

Is CVE-2026-32201 being exploited?

Yes. CISA added CVE-2026-32201 to the Known Exploited Vulnerabilities catalog on 14 Apr 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-32201 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-32201?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected SharePoint Server and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2026 · Microsoft scorecard · act-now radar.

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