{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "<a href=\"https://th.linkedin.com/in/navaponpremkasem\">Navapon Premkasem</a>"
        ]
      },
      {
        "names": [
          "<a href=\"https://www.linkedin.com/in/thimphaching-phengphavanh-458949219/\">Thimphaching Phengphavanh</a>"
        ]
      },
      {
        "names": [
          "<a href=\"https://www.linkedin.com/in/songsit-srisura/\">Songsit Srisura</a>"
        ]
      },
      {
        "names": [
          "<a href=\"https://www.linkedin.com/in/prawee-lertprasertphan\">0x00</a>"
        ]
      },
      {
        "names": [
          "<a href=\"https://www.linkedin.com/in/jattawatt-buranasant-891783107/\">Jattawatt Buranasant</a>"
        ]
      },
      {
        "names": [
          "<a href=\"https://www.linkedin.com/in/supawee-foitong/\">Supawee Foitong</a>"
        ]
      },
      {
        "names": [
          "P1hcn"
        ]
      }
    ],
    "aggregate_severity": {
      "namespace": "https://www.microsoft.com/en-us/msrc/security-update-severity-rating-system",
      "text": "Important"
    },
    "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-2026-70355 Microsoft SharePoint Server Elevation of Privilege Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355"
      },
      {
        "category": "self",
        "summary": "CVE-2026-70355 Microsoft SharePoint Server Elevation of Privilege Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-70355.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": "2026-08-11T07:00:00.000Z",
      "generator": {
        "date": "2026-08-31T20:04:03.961Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-70355",
      "initial_release_date": "2026-08-11T07:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-08-11T07:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<16.0.10417.20198",
                "product": {
                  "name": "Microsoft SharePoint Server 2019 <16.0.10417.20198",
                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.10417.20198",
                "product": {
                  "name": "Microsoft SharePoint Server 2019 16.0.10417.20198",
                  "product_id": "11585"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft SharePoint Server 2019"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<16.0.19725.20522",
                "product": {
                  "name": "Microsoft SharePoint Server Subscription Edition <16.0.19725.20522",
                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.19725.20522",
                "product": {
                  "name": "Microsoft SharePoint Server Subscription Edition 16.0.19725.20522",
                  "product_id": "11961"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft SharePoint Server Subscription Edition"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-70355",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Successful exploitation could allow an attacker to run script in the security context of the affected SharePoint user and perform actions permitted to that user.",
          "title": "What privileges could be gained by an attacker who successfully exploited this vulnerability?"
        },
        {
          "category": "faq",
          "text": "Yes. Customers should apply all updates offered for the software installed on their systems. If multiple updates apply, they can be installed in any order.",
          "title": "There are multiple update packages available for some of the affected software. Do I need to install all the updates listed in the Security Updates table for the software?"
        }
      ],
      "product_status": {
        "fixed": [
          "11585",
          "11961"
        ],
        "known_affected": [
          "1",
          "2"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-70355 Microsoft SharePoint Server Elevation of Privilege Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70355"
        },
        {
          "category": "self",
          "summary": "CVE-2026-70355 Microsoft SharePoint Server Elevation of Privilege Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-70355.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "16.0.10417.20198:Security Update:https://support.microsoft.com/help/5002894",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5002894"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "16.0.10417.20198:Security Update:https://support.microsoft.com/help/5002896",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5002896"
        },
        {
          "category": "vendor_fix",
          "date": "2026-08-11T07:00:00.000Z",
          "details": "16.0.19725.20522:Security Update:https://support.microsoft.com/help/5002893",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5002893"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 7.3,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "1",
            "2"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Elevation of Privilege"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation More Likely"
        }
      ],
      "title": "Microsoft SharePoint Server Elevation of Privilege Vulnerability"
    }
  ]
}