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6.5 Medium Exploited · ransomware

CVE-2025-49706 Microsoft SharePoint Improper Authentication Vulnerability

Active exploitation observed

· CISA KEV catalogue
Required action Disconnect public-facing versions of SharePoint Server that have reached their end-of-life (EOL) or end-of-service (EOS) to include SharePoint Server 2013 and earlier versions. For supported versions, please follow the mitigations according to CISA (URL listed below in Notes) and vendor instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Ransomware campaigns Known to be used
Weakness CWE-287

Description

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

Affected products and versions

Product Affected versions Fixed in
Microsoft SharePoint Enterprise Server 2016 16.0 16.0.0 → < 16.0.5508.1000 16.0.5508.1000
Microsoft SharePoint Server 2019 16.0 16.0.0 → < 16.0.10417.20027 16.0.10417.20027
Microsoft SharePoint Server Subscription Edition 16.0 16.0.0 → < 16.0.18526.20424 16.0.18526.20424

References

Timeline

  1. Published
  2. Added to the KEV catalogue
  3. Last modified

Other CVEs of Microsoft SharePoint Enterprise Server 2016

The 337 CVEs of Microsoft SharePoint Enterprise Server 2016 →
CVE-2026-97783 Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint… 8.1 High CVE-2026-69943 Improper limitation of a pathname to a restricted directory ('path traversal') in Microsoft Office SharePoint allows… 8.8 High CVE-2026-62917 Improper input validation in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a… 4.6 Medium CVE-2026-58639 Server-side request forgery (ssrf) in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over… 6.5 Medium
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