CVE-2026-56164 (GCVE-0-2026-56164)

Vulnerability from cvelistv5 – Published: 2026-07-14 17:05 – Updated: 2026-07-14 19:58
VLAI CISA KEVIntel
Title
Microsoft SharePoint Server Elevation of Privilege Vulnerability
Summary
Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Severity
5.3 (Medium)
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
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
References
Impacted products
Date Public
2026-07-14 14:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: b9502bf2-2c02-4bd0-9d73-939c033e08de

Vulnerability ID: CVE-2026-56164

Status: Confirmed

Status Updated: 2026-07-14 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-14
Asserted: 2026-07-14
Scope
Notes: Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability | Affected: Microsoft / SharePoint Server | Description: Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-07-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56164
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-306
Feed CISA Known Exploited Vulnerabilities Catalog
Product SharePoint Server
Due Date 2026-07-17
Date Added 2026-07-14
Vendorproject Microsoft
Vulnerabilityname Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-07-14 19:00 UTC | Updated: 2026-07-14 19:00 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 668b2838-95c6-4ab3-abc0-8c35823f659e

Vulnerability ID: CVE-2026-56164

Status: Confirmed

Status Updated: 2026-07-14 07:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-07-14
Asserted: 2026-07-14
Scope
Notes: Microsoft SharePoint Server Elevation of Privilege Vulnerability | Affected: Microsoft / Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition | CVSS: 5.3 (MEDIUM) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Microsoft SharePoint Server Elevation of Privilege Vulnerability
Vendor Microsoft
Product Microsoft SharePoint Enterprise Server 2016, Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition
Added Date 2026-07-14T07:00:00.000Z
Cvss Score 5.3
Epss Score None
Cvss Severity MEDIUM
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-07-14 18:00 UTC | Updated: 2026-07-14 18:00 UTC
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-56164",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-14T18:45:11.388695Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-07-14",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-14T19:58:23.595Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-07-14T00:00:00.000Z",
            "value": "CVE-2026-56164 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft SharePoint Enterprise Server 2016",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.5561.1001",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft SharePoint Server 2019",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.10417.20175",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft SharePoint Server Subscription Edition",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.19725.20434",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:sharepoint_server_2016:*:*:*:*:enterprise:*:*:*",
                  "versionEndExcluding": "16.0.5561.1001",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:sharepoint_server_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.0.10417.20175",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*",
                  "versionEndExcluding": "16.0.19725.20434",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-07-14T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "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"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-306",
              "description": "CWE-306: Missing Authentication for Critical Function",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-14T19:37:20.775Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Microsoft SharePoint Server Elevation of Privilege Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164"
        }
      ],
      "title": "Microsoft SharePoint Server Elevation of Privilege Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-56164",
    "datePublished": "2026-07-14T17:05:12.313Z",
    "dateReserved": "2026-06-19T13:53:31.988Z",
    "dateUpdated": "2026-07-14T19:58:23.595Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2026-56164",
      "cwes": "[\"CWE-306\"]",
      "dateAdded": "2026-07-14",
      "dueDate": "2026-07-17",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-56164 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-56164",
      "product": "SharePoint Server",
      "requiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.",
      "shortDescription": "Microsoft SharePoint contains a missing authentication for critical function vulnerability that allows an unauthorized attacker to elevate privileges over a network.",
      "vendorProject": "Microsoft",
      "vulnerabilityName": "Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-56164\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2026-07-14T17:17:09.907\",\"lastModified\":\"2026-07-14T19:34:20.957\",\"vulnStatus\":\"Undergoing Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.\"}],\"affected\":[{\"source\":\"secure@microsoft.com\",\"affectedData\":[{\"vendor\":\"Microsoft\",\"product\":\"Microsoft SharePoint Enterprise Server 2016\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.0\",\"lessThan\":\"16.0.5561.1001\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft SharePoint Server 2019\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.0\",\"lessThan\":\"16.0.10417.20175\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft SharePoint Server Subscription Edition\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.0\",\"lessThan\":\"16.0.19725.20434\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-07-14T18:45:11.388695Z\",\"id\":\"CVE-2026-56164\",\"options\":[{\"exploitation\":\"active\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"cisaExploitAdd\":\"2026-07-14\",\"cisaActionDue\":\"2026-07-17\",\"cisaRequiredAction\":\"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset\u0027s internet exposure and ensuring adherence to BOD 26-04 patching guidelines.\",\"cisaVulnerabilityName\":\"Microsoft SharePoint Server Missing Authentication for Critical Function Vulnerability\",\"weaknesses\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-306\"}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164\",\"source\":\"secure@microsoft.com\"},{\"url\":\"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-56164\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-14T18:45:11.388695Z\"}}}], \"references\": [{\"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-56164\", \"tags\": [\"government-resource\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-14T17:32:39.759Z\"}}], \"cna\": {\"title\": \"Microsoft SharePoint Server Elevation of Privilege Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 5.3, \"baseSeverity\": \"MEDIUM\", \"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\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"Microsoft SharePoint Enterprise Server 2016\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0\", \"lessThan\": \"16.0.5561.1001\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft SharePoint Server 2019\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0\", \"lessThan\": \"16.0.10417.20175\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft SharePoint Server Subscription Edition\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0\", \"lessThan\": \"16.0.19725.20434\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2026-07-14T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56164\", \"name\": \"Microsoft SharePoint Server Elevation of Privilege Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Missing authentication for critical function in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-306\", \"description\": \"CWE-306: Missing Authentication for Critical Function\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:sharepoint_server_2016:*:*:*:*:enterprise:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.5561.1001\", \"versionStartIncluding\": \"16.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:sharepoint_server_2019:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.10417.20175\", \"versionStartIncluding\": \"16.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.19725.20434\", \"versionStartIncluding\": \"16.0.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-07-14T18:53:01.714Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-56164\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-14T18:53:01.714Z\", \"dateReserved\": \"2026-06-19T13:53:31.988Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-07-14T17:05:12.313Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.