VulnTideExploited vulnerabilities, by vendor. Data as of .
Not in CISA KEVReported exploited: VulnCheck KEV since Published CVSS 6.5 mediumEPSS 99.9% probability of exploitation in 30 days
Microsoft

CVE-2025-53771: Microsoft SharePoint Server Spoofing Vulnerability

Is it exploited?

Reported, not confirmed by CISA. VulnCheck KEV lists it as exploited in the wild. CISA has not added it to its Known Exploited Vulnerabilities catalog as of .

VulnCheck KEV lists it since . It cites 65 public reports, the first from .

How likely is exploitation in the next 30 days?
99.9%

EPSS score, percentile 100 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?
6.5 Medium

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

  • from 16.0.0 to before 16.0.5513.1001
  • from 16.0.0 to before 16.0.10417.20037
  • from 16.0.0 to before 16.0.18526.20508

Versions by product

Source: CISA KEV 2026.10.29, as of ; VulnCheck KEV, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.

Description

Microsoft SharePoint Server Spoofing Vulnerability

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

Source: CVE List, as of . About the data.

What to do

Advisories and patches

This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Versions by product, as listed in the CVE record (3 products)
Microsoft Microsoft SharePoint Enterprise Server 2016
StatusVersions
Affectedfrom 16.0.0 to before 16.0.5513.1001
Microsoft Microsoft SharePoint Server 2019
StatusVersions
Affectedfrom 16.0.0 to before 16.0.10417.20037
Microsoft Microsoft SharePoint Server Subscription Edition
StatusVersions
Affectedfrom 16.0.0 to before 16.0.18526.20508

Source: CVE List, as of . About the data.

Weakness

CWE-287

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

DateEvent
CVE record published
CVE record last updated

Known exploited Microsoft vulnerabilities

  • CVE-2026-96951: Microsoft Windows Command Injection Vulnerability (added )
  • CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability (added )
  • CVE-2026-81963: Microsoft Windows Link Following Vulnerability (added )
  • CVE-2026-85880: Microsoft Windows Heap-Based Buffer Overflow Vulnerability (added )
  • CVE-2019-1068: Microsoft SQL Server Remote Code Execution Vulnerability (added )