# CVE-2026-32201: Microsoft SharePoint Server improper input validation spoofing vulnerability

Source: https://junglewise.ai/threats/cve-2026-32201-microsoft-sharepoint-server-improper-input-validation-spoofing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-14. Updated: 2026-05-28  
License: CC BY 4.0 with a link back

CVE-2026-32201 · Severity: critical · CVSS 6.5 · Exploited in the wild · Published 2026-04-14

Microsoft SharePoint, a widely used platform for corporate collaboration and document management, is affected by a security flaw that allows unauthorized individuals to perform spoofing attacks. An attacker could exploit this to impersonate legitimate services or users, potentially leading to unauthorized access to internal information or the delivery of deceptive content to employees. This vulnerability has been identified as being actively exploited in the wild, making immediate patching a priority for maintaining organizational trust and data integrity.

Technologies: [Microsoft SharePoint Server](https://junglewise.ai/threats/technologies/sharepoint-server), [Microsoft SharePoint Server 2016 Enterprise Edition](https://junglewise.ai/threats/technologies/sharepoint-server-2016-enterprise-edition), [Microsoft SharePoint Server 2019](https://junglewise.ai/threats/technologies/sharepoint-server-2019), [Microsoft SharePoint Server Subscription Edition](https://junglewise.ai/threats/technologies/sharepoint-server-subscription-edition). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-32201 exploited in the wild?** Yes. CVE-2026-32201 is known to be exploited in the wild, first recorded on 14 April 2026. Treat it as urgent.

**How severe is CVE-2026-32201?** Critical severity, with a CVSS score of 6.5, published 14 April 2026.

**Which products and versions are affected?** Microsoft SharePoint Server 2016 Enterprise Edition; Microsoft SharePoint Server Subscription Edition up to (excluding) 16.0.19725.20210.

**Is there a fix for CVE-2026-32201?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-32201 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-32201?** Check whether you run Microsoft SharePoint Server, Microsoft SharePoint Server 2016, Microsoft SharePoint Server 2016 Enterprise Edition or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability exists in Microsoft SharePoint Server due to improper input validation (CWE-20). An unauthenticated attacker can exploit this flaw over the network to perform spoofing attacks. The vulnerability affects SharePoint Server 2016, 2019, and Subscription Edition. While the CVSS score is 6.5 (Medium), the vulnerability is notable for its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation. Microsoft has released security updates to address this issue; administrators should apply the latest patches for their specific SharePoint version.

## Affected products

- Microsoft SharePoint Server 2016 Enterprise Edition
- Microsoft SharePoint Server 2019
- Microsoft SharePoint Server Subscription Edition up to (excluding) 16.0.19725.20210

## Timeline

- 2026-04-14: disclosed
- 2026-04-14: advisory: Microsoft and NVD published details
- 2026-04-14: kev added: Added to CISA KEV catalog due to active exploitation

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32201)

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