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Vulnerabilities

Vulnerability · CVE-2025-21393

CVE-2025-21393 is listed by Microsoft SharePoint Server Spoofing Vulnerability.

Published Jan 14, 2025 · catalog updated Jun 17, 2026 · sharepoint server

Last checked Nov 2, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-21393. EPSS is 1.06%. Act only if a listed version of sharepoint server is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium6.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.06%
Remediation
Version ranges on file
Affected products
cpe microsoft/sharepoint server

CVE-2025-21393 is listed by Microsoft SharePoint Server Spoofing Vulnerability.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe microsoft/sharepoint server2016
  • cpe microsoft/sharepoint server2019
  • cpe microsoft/sharepoint server< 16.0.17928.20356

How to fix CVE-2025-21393

  • Upgrade

    CVE-2025-21393 lists a fix boundary at 16.0.17928.20356. Compare the installed build with that boundary before you change production.

  • Version check

    Affected < 16.0.17928.20356

  • Advisory

    Open the inventory_critical record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-21393. EPSS is 1.06%. Act only if a listed version of sharepoint server is installed.

Which versions are affected?

Compare what you have installed with microsoft/sharepoint server 2016; microsoft/sharepoint server 2019; microsoft/sharepoint server < 16.0.17928.20356. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-79: Cross-site Scripting (XSS). EPSS 1.06%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Microsoft SharePoint security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 14, 2025 · Monitored products — critical

    Detected

    CVE-2025-21393 is listed by Microsoft SharePoint Server Spoofing Vulnerability.

  2. Jun 17, 2026 · Monitored products — critical

    Updated

    CVE-2025-21393 is listed by Microsoft SharePoint Server Spoofing Vulnerability.

Sources

References

Freshness

Last verified in this catalog Nov 2, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • Monitored products — criticalNov 2, 2026