CVE-2026-32201 — Microsoft SharePoint Server

As of 2026-04-14, CVE-2026-32201 is a HIGH-severity vulnerability in Microsoft SharePoint Server, CVSS v3.1 8.8, EPSS 8.9% (92.7th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-04-14), with a US federal remediation deadline of 2026-04-28. Threadlinqs Intelligence links 14 tracked threat campaigns to CVE-2026-32201, most recently “CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV Catalog”.

Last updated: 2026-04-14

What is CVE-2026-32201?

An improper authentication vulnerability in Microsoft SharePoint Server allows an unauthenticated remote attacker to craft a forged request that impersonates an authenticated user, enabling session hijack, unauthorized data access, and subsequent upload of malicious content. This zero-day vulnerability was confirmed as actively exploited in the wild prior to the April 2026 Patch Tuesday release, with exploitation activity concentrated against government, legal, and manufacturing verticals in North America and Europe. Observed post-exploitation behavior includes web-shell deployment (spinstall.aspx variants), credential harvesting from the SharePoint hive, and pivoting to the SQL backend via integrated Windows authentication. Threat actors have been observed chaining this spoofing vulnerability with CVE-2026-33827 (SharePoint Server RCE via deserialization in workflow engine) for full remote code execution.

The record classifies CVE-2026-32201 under weakness class CWE-287. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 151 days ago.

Severity and exploitation probability

CVSS v3.1 base score

8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS (FIRST)

8.9% probability of exploitation in the next 30 days, higher than 92.7% of all scored CVEs

CISA KEV

Listed since 2026-04-14, federal remediation deadline 2026-04-28

Threadlinqs priority

9/10 — CISA KEV-listed, which Threadlinqs floors at 9

Published

2026-04-14

Is CVE-2026-32201 being exploited?

CISA added CVE-2026-32201 to the Known Exploited Vulnerabilities catalog on 2026-04-14, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-04-28 under BOD 22-01. It currently carries a trending score of 38 in the Threadlinqs vulnerability feed.

Affected products and versions

• Microsoft: SharePoint Server, SharePoint Server Subscription Edition

How to fix CVE-2026-32201

The record marks a vendor fix as available for CVE-2026-32201. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201. Because CVE-2026-32201 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-04-28. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-32201

14 tracked threats in the Threadlinqs corpus reference CVE-2026-32201, either in the campaign’s CVE list or as an indicator on the campaign record.

• CISA Adds Exploited SharePoint RCE Zero-Day CVE-2026-58644 to KEV Catalog — CRITICAL · 2026-07-17
• July 2026 Patch Tuesday: Actively Exploited SharePoint RCE (CVE-2026-58644) and AD FS/SharePoint Zero-Days — CRITICAL · 2026-07-17
• CVE-2026-58644: Microsoft SharePoint Server Unauthenticated Remote Code Execution Exploited in the Wild — CRITICAL · 2026-07-17
• CISA Warns of Active Exploitation of Three Microsoft SharePoint Server Vulnerabilities (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164) — CRITICAL · 2026-07-15
• CVE-2026-56164: Microsoft SharePoint Server Missing-Authentication Vulnerability Actively Exploited, Added to CISA KEV — CRITICAL · 2026-07-15
• July 2026 Patch Tuesday: Microsoft Fixes 622 CVEs Including Three Actively-Targeted Zero-Days (CVE-2026-56155 AD FS EoP, CVE-2026-56164 SharePoint EoP, CVE-2026-50661 BitLocker Bypass) — CRITICAL · 2026-07-15
• CISA Warns of Trio of Actively Exploited SharePoint Server Flaws (CVE-2026-32201, CVE-2026-45659, CVE-2026-56164) — CRITICAL · 2026-07-15
• Microsoft July 2026 Patch Tuesday: 570 Flaws Fixed, 3 Zero-Days Including AD FS and SharePoint Privilege Escalation — CRITICAL · 2026-07-14
• Microsoft July 2026 Patch Tuesday: Record 622 Flaws Fixed, Two Zero-Days Under Active Exploitation (CVE-2026-56164, CVE-2026-56155) — CRITICAL · 2026-07-14
• CVE-2026-45659: Microsoft SharePoint Server Deserialization RCE Added to CISA KEV — HIGH · 2026-07-02
• CVE-2026-45659: Microsoft SharePoint Deserialization RCE Actively Exploited, Added to CISA KEV — HIGH · 2026-07-02
• Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE) — CRITICAL · 2026-04-19
• CVE-2026-32201: Microsoft SharePoint Server Zero-Day Spoofing Vulnerability via Improper Input Validation (Actively Exploited) — CRITICAL · 2026-04-15
• Microsoft April 2026 Patch Tuesday — 167 Flaws, 2 Zero-Days (SharePoint Spoofing CVE-2026-32201 + Defender EoP CVE-2026-33825) — CRITICAL · 2026-04-14

Sources

Seeded from threat-derived and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

• msrc.microsoft.com

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