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Response snapshot Oct 26, 2026, 22:38 UTC

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VulnerabilityCVE-2026-32201Known exploitation

Microsoft SharePoint Server Improper Input Validation Vulnerability

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

At a glance

Exploited
Yes: on CISA's Known Exploited list
Severity
6.5 Medium (CVSS 3.1)
Chance of exploitation
43.4% in the next 30 days
CISA federal deadline
Apr 28, 2026: passed
Sources
4 independent sources

What 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.

Read CISA KEV entry CVE-2026-32201 (opens a new tab)

CISA federal deadline

Federal due date passed

Applies to covered US federal agencies; it is not your organization's deadline.

Added to the catalog Known ransomware use: Unknown
CISA catalog (opens a new tab)

Scores and how they were measured

CVSS base severity

6.5

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

43.4%

Scored Percentile 98.7%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    CISA KEV entry CVE-2026-32201 (opens a new tab)

    The CVE-2026-32201 catalog entry establishes known exploitation, date added, required action, and the federal due date; not zero-day status.

    Published Checked

  2. Primary source

    NVD CVE-2026-32201 (opens a new tab)

    NVD record: description, CVSS, affected products, and a CISA SSVC assessment reporting active exploitation.

    Published Checked

  3. Primary source

    Vendor advisory (via NVD references) (opens a new tab)

    The vendor advisory referenced by the CVE record, for affected versions and fixes.

    Published Date not suppliedChecked

  4. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  5. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-32201, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

  6. Primary source

    CVE Program CNA microsoft (opens a new tab)

    The published CVE-2026-32201 document's CNA supplies this CVSS 3.1 base score, vector, and authoritative source update date.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 26). Microsoft SharePoint Server Improper Input Validation Vulnerability (CVE-2026-32201). https://kevwire.com/record/CVE-2026-32201

MLA

"Microsoft SharePoint Server Improper Input Validation Vulnerability (CVE-2026-32201)." KEVWire, 26 Oct. 2026, kevwire.com/record/CVE-2026-32201.

Chicago

KEVWire. "Microsoft SharePoint Server Improper Input Validation Vulnerability (CVE-2026-32201)." Last modified October 26, 2026. https://kevwire.com/record/CVE-2026-32201.

Evidence summary (plain text)

Microsoft SharePoint Server Improper Input Validation Vulnerability (Apr 14, 2026).
Microsoft SharePoint Server contains an improper input validation vulnerability that allows an unauthorized attacker to perform spoofing over a network.
CVSS 6.5 (version 3.1; evidence as of Oct 15, 2026; https://cveawg.mitre.org/api/cve/CVE-2026-32201).
EPSS 43.4% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-32201&date=2026-10-26).
Sources:
CISA KEV entry CVE-2026-32201: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json
NVD CVE-2026-32201: https://nvd.nist.gov/vuln/detail/CVE-2026-32201
Vendor advisory (via NVD references): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-10-26T20:37:18.143Z&lastModEndDate=2026-10-26T22:10:56.995Z&resultsPerPage=500&startIndex=1000
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-32201&date=2026-10-26
CVE Program CNA microsoft: https://cveawg.mitre.org/api/cve/CVE-2026-32201
Record ID: CVE-2026-32201.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Documented by a cited source.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
CISA federal due date: Apr 28, 2026. This is a deadline for covered US federal agencies, not the reader's SLA.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 20:01 UTC. Ingestion is not an independent editorial investigation.

CISA added this entry on 2026-04-14. This record's publication date is the catalog addition date, not necessarily the initial vulnerability disclosure. KEV means known exploitation, not necessarily a zero-day. CISA due dates apply to covered US federal agencies, not your organizational SLA.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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