Risk Letters

Exploited vulnerability

CVE-2026-56164

TLP:CLEAR

Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability

Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.

Facts

  • Vendor: Microsoft
  • Product: SharePoint Server
  • CVSS: 5.3
  • EPSS (probability of exploitation within 30 days): 1 %
  • On CISA's Known Exploited Vulnerabilities list since: 14 July 2026
  • First known exploitation: 14 July 2026
  • CISA's deadline for US federal agencies: 17 July 2026
  • Weakness: CWE-306
  • First seen by Risk Letters: 14 July 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD