Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2026-32201

Microsoft SharePoint Server Spoofing Vulnerability

Microsoft SharePoint Enterprise Server 2016 · affected before 16.0.5548.1003

Watch CVE-2026-32201 Browse KEV feed
Severity
CVSS 6.5 · Medium
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
43.4%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-32201 is an unauthenticated Microsoft SharePoint Server Spoofing Vulnerability. Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

Microsoft SharePoint Enterprise Server 2016 affected before 16.0.5548.1003.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Microsoft SharePoint Server Spoofing Vulnerability

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

Microsoft Affected
Microsoft SharePoint Enterprise Server 2016
Before 16.0.5548.1003
Microsoft Affected
Microsoft SharePoint Server 2019
Before 16.0.10417.20114
Microsoft Affected
Microsoft SharePoint Server Subscription Edition
Before 16.0.19725.20210
View vendor advisory (opens in new tab)
Published
14 Apr 2026
Exploitation Reported
01 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

cisa microsoft

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CVE

Recorded 01 Jun 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CVE First 2026-06-01 13:07 UTC
CISA 2026-06-02 14:02 UTC
All CISA Advisories 2026-07-14 19:21 UTC
Daily CyberSecurity 2026-07-15 01:05 UTC
Tenable Blog 2026-07-16 16:00 UTC
CERT-EU 2026-07-23 09:13 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

6.5 Medium

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

43.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Input Validation CWE-20

Recent mention · CERT-EU

2026-009: Critical Vulnerabilities in Microsoft SharePoint

[UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of...

Read full advisory

All Mentions

Recent mention · CERT-EU

2026-009: Critical Vulnerabilities in Microsoft SharePoint

CERT-EU · 23 Jul 2026

[UPDATED] On 14 July 2026, Microsoft released security updates addressing critical remote code execution (RCE) vulnerabilities in Microsoft SharePoint Server. On 20 July 2026, WatchTowr identified a proof-of-concept exploit code and subsequently observed active exploitation of CVE-2026-50522, a vulnerability part of an ongoing series of actively exploited flaws affecting on-premise SharePoint Server instances, including CVE-2026-32201, CVE-2026-45659, CVE-2026-56164, and CVE-2026-58644. CERT-EU strongly recommends updating affected servers immediately, rotating credentials for any assets...

Recent mention · Tenable Blog

CVE-2026-32201, CVE-2026-45659, CVE-2026-56164: Frequently Asked Questions About Active Exploitation of Microsoft SharePoint Server Vulnerabilities

Tenable Blog · 16 Jul 2026

Four Microsoft SharePoint Server vulnerabilities are under active exploitation, prompting CISA to issue a hardening alert. An additional high-severity flaw recently patched adds pressure for organizations running on-premises deployments.Key TakeawaysCISA confirmed active exploitation of three on-premises SharePoint Server vulnerabilities (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164), used to gain unauthorized access, establish remote code execution, steal IIS machine keys and deploy malware for persistence.Two additional SharePoint Server vulnerabilities disclosed on July 14, 2026,...

Recent mention · Daily CyberSecurity

CISA Warns Three SharePoint Server Vulnerabilities Are Exploited in the Wild, Urges Hardening

Daily CyberSecurity · 15 Jul 2026

TL;DR CISA has confirmed active exploitation of three SharePoint vulnerabilities: CVE-2026-32201, CVE-2026-45659, and CVE-2026-56164. Threat actors chain them The post CISA Warns Three SharePoint Server Vulnerabilities Are Exploited in the Wild, Urges Hardening appeared first on Daily CyberSecurity.

Recent mention · All CISA Advisories

CISA Urges SharePoint Hardening After New Exploitations

All CISA Advisories · 14 Jul 2026

CISA is aware of active exploitation of vulnerabilities CVE-2026-32201, CVE-2026-45659, and CVE-2026-56164, enabling cyber threat actors to gain unauthorized access to on-premises SharePoint Server instances. These vulnerabilities affect all supported on-premises SharePoint Server versions (Subscription Edition, 2019, and 2016) and involve establishing remote code execution (RCE) and post-exploitation activities, such as stealing Internet Information Services (IIS) machine keys and performing deserialization techniques, to gain persistence and deploy malware. Organizations should monitor...

Timeline

From disclosure to observed exploitation

  1. 09:13 UTC

    KEV confirmed by CERT-EU

    Exploitation attested by an external source

  2. 16:00 UTC

    KEV confirmed by Tenable Blog

    Exploitation attested by an external source

  3. 01:05 UTC

    KEV confirmed by Daily CyberSecurity

    Exploitation attested by an external source

  4. 19:21 UTC

    KEV confirmed by All CISA Advisories

    Exploitation attested by an external source

  5. 14:02 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  6. 13:07 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  7. 16:58 UTC

    CVE published

    Vulnerability disclosed publicly

  8. 01:49 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

Start 14-day Pro trial Read API docs
  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-32201

Sample API response 
{
  "cve_id": "CVE-2026-32201",
  "confidence": "Confirmed",
  "cvss_score": 6.5,
  "cvss_estimated": false,
  "epss_score": 0.43378,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}