{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Anonymous"
        ]
      },
      {
        "names": [
          "Genwei Jiang with \u003ca href=\"https://cloud.google.com/security/mandiant\"\u003eGoogle Cloud, FLARE OTF\u003c/a\u003e"
        ]
      },
      {
        "names": [
          "Jayson Frost with \u003ca href=\"https://cloud.google.com/security/consulting/mandiant-incident-response-services\"\u003eMandiant Incident Response\u003c/a\u003e"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "Public",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-US",
    "notes": [
      {
        "category": "general",
        "text": "To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle",
        "title": "Additional Resources"
      },
      {
        "category": "legal_disclaimer",
        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
        "title": "Disclaimer"
      },
      {
        "category": "general",
        "text": "Required. The vulnerability documented by this CVE requires customer action to resolve.",
        "title": "Customer Action"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "secure@microsoft.com",
      "name": "Microsoft Security Response Center",
      "namespace": "https://msrc.microsoft.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164"
      },
      {
        "category": "self",
        "summary": "CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-56164.json"
      },
      {
        "category": "external",
        "summary": "Microsoft Exploitability Index",
        "url": "https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1"
      },
      {
        "category": "external",
        "summary": "Microsoft Support Lifecycle",
        "url": "https://support.microsoft.com/lifecycle"
      },
      {
        "category": "external",
        "summary": "Common Vulnerability Scoring System",
        "url": "https://www.first.org/cvss"
      }
    ],
    "title": "Microsoft SharePoint Server Elevation of Privilege Vulnerability",
    "tracking": {
      "current_release_date": "2026-07-14T07:00:00.000Z",
      "generator": {
        "date": "2026-07-14T20:05:38.134Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-56164",
      "initial_release_date": "2026-07-14T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-07-14T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.5561.1001",
            "product": {
              "name": "Microsoft SharePoint Enterprise Server 2016 \u003c16.0.5561.1001",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.5561.1001",
            "product": {
              "name": "Microsoft SharePoint Enterprise Server 2016 16.0.5561.1001",
              "product_id": "10950"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Enterprise Server 2016"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.10417.20175",
            "product": {
              "name": "Microsoft SharePoint Server 2019 \u003c16.0.10417.20175",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.10417.20175",
            "product": {
              "name": "Microsoft SharePoint Server 2019 16.0.10417.20175",
              "product_id": "11585"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Server 2019"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.19725.20434",
            "product": {
              "name": "Microsoft SharePoint Server Subscription Edition \u003c16.0.19725.20434",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.19725.20434",
            "product": {
              "name": "Microsoft SharePoint Server Subscription Edition 16.0.19725.20434",
              "product_id": "11961"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Server Subscription Edition"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-56164",
      "cwe": {
        "id": "CWE-306",
        "name": "Missing Authentication for Critical Function"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "The attack vector is Network (AV:N) because this vulnerability is remotely exploitable and can be exploited from the internet. The attack complexity is Low (AC:L) because an attacker does not require significant prior knowledge of the system and can achieve repeatable success with the payload against the vulnerable component.",
          "title": "According to the CVSS metric, the attack vector is network (AV:N) and the attack complexity is low (AC:L). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Yes. The same KB number applies to both SharePoint Server 2016 and SharePoint Enterprise Server 2016. Customers running either version should install the security update to be protected from this vulnerability.",
          "title": "I am running SharePoint Server 2016. Do the updates for SharePoint Enterprise Server 2016 also apply to the version I am running?"
        }
      ],
      "product_status": {
        "fixed": [
          "10950",
          "11585",
          "11961"
        ],
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164"
        },
        {
          "category": "self",
          "summary": "CVE-2026-56164 Microsoft SharePoint Server Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-56164.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-14T07:00:00.000Z",
          "details": "16.0.5561.1001:Security Update:https://support.microsoft.com/help/5002891",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5002891"
        },
        {
          "category": "vendor_fix",
          "date": "2026-07-14T07:00:00.000Z",
          "details": "16.0.10417.20175:Security Update:https://support.microsoft.com/help/5002883",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5002883"
        },
        {
          "category": "vendor_fix",
          "date": "2026-07-14T07:00:00.000Z",
          "details": "16.0.19725.20434:Security Update:https://support.microsoft.com/help/5002882",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5002882"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "environmentalScore": 0.0,
            "exploitCodeMaturity": "FUNCTIONAL",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.9,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:F/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected"
        }
      ],
      "title": "Microsoft SharePoint Server Elevation of Privilege Vulnerability"
    }
  ]
}