{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Felix Boulet"
        ]
      }
    ],
    "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-2025-21393 Microsoft SharePoint Server Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21393"
      },
      {
        "category": "self",
        "summary": "CVE-2025-21393 Microsoft SharePoint Server Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21393.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 Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2025-01-27T00:00:00.000Z",
      "generator": {
        "date": "2026-04-02T00:47:54.430Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2025-21393",
      "initial_release_date": "2025-01-14T00:00:00.000Z",
      "revision_history": [
        {
          "date": "2025-01-14T00:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        },
        {
          "date": "2025-01-27T00:00:00.000Z",
          "legacy_version": "1.1",
          "number": "2",
          "summary": "Added an FAQ to indicate that the Preview Pane is not affected for this CVE. This is an informational change only."
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.5483.1001",
            "product": {
              "name": "Microsoft SharePoint Enterprise Server 2016 \u003c16.0.5483.1001",
              "product_id": "3"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.5483.1001",
            "product": {
              "name": "Microsoft SharePoint Enterprise Server 2016 16.0.5483.1001",
              "product_id": "10950"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Enterprise Server 2016"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.10416.20041",
            "product": {
              "name": "Microsoft SharePoint Server 2019 \u003c16.0.10416.20041",
              "product_id": "2"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.10416.20041",
            "product": {
              "name": "Microsoft SharePoint Server 2019 16.0.10416.20041",
              "product_id": "11585"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Server 2019"
      },
      {
        "branches": [
          {
            "category": "product_version_range",
            "name": "\u003c16.0.17928.20356",
            "product": {
              "name": "Microsoft SharePoint Server Subscription Edition \u003c16.0.17928.20356",
              "product_id": "1"
            }
          },
          {
            "category": "product_version",
            "name": "16.0.17928.20356",
            "product": {
              "name": "Microsoft SharePoint Server Subscription Edition 16.0.17928.20356",
              "product_id": "11961"
            }
          }
        ],
        "category": "product_name",
        "name": "Microsoft SharePoint Server Subscription Edition"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-21393",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Integrity is impacted as XSS allows an attacker to add their malicious script to fetch victim\u0027s sensitive info or to change DOM execution.",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to some loss of integrity (I:L)? What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "The attacker must be authenticated to the target site as at least a Site Member.",
          "title": "According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerability. However, an attacker would have no way to force the user to visit the website. Instead, an attacker would have to convince the user to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince the user to open the specially crafted file.",
          "title": "According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?"
        },
        {
          "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?"
        },
        {
          "category": "faq",
          "text": "No, the Preview Pane is not an attack vector.",
          "title": "Is the Preview Pane an attack vector for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "10950",
          "11585",
          "11961"
        ],
        "known_affected": [
          "1",
          "2",
          "3"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2025-21393 Microsoft SharePoint Server Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21393"
        },
        {
          "category": "self",
          "summary": "CVE-2025-21393 Microsoft SharePoint Server Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2025/msrc_cve-2025-21393.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-01-14T00:00:00.000Z",
          "details": "16.0.5483.1001:Security Update:https://support.microsoft.com/help/5002672",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5002672"
        },
        {
          "category": "vendor_fix",
          "date": "2025-01-14T00:00:00.000Z",
          "details": "16.0.5483.1001:Security Update:https://support.microsoft.com/help/5002671",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5002671"
        },
        {
          "category": "vendor_fix",
          "date": "2025-01-14T00:00:00.000Z",
          "details": "16.0.10416.20041:Security Update:https://support.microsoft.com/help/5002666",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5002666"
        },
        {
          "category": "vendor_fix",
          "date": "2025-01-14T00:00:00.000Z",
          "details": "16.0.10416.20041:Security Update:https://support.microsoft.com/help/5002667",
          "product_ids": [
            "2"
          ],
          "url": "https://support.microsoft.com/help/5002667"
        },
        {
          "category": "vendor_fix",
          "date": "2025-01-14T00:00:00.000Z",
          "details": "16.0.17928.20356:Security Update:https://support.microsoft.com/help/5002676",
          "product_ids": [
            "1"
          ],
          "url": "https://support.microsoft.com/help/5002676"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 5.5,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Microsoft SharePoint Server Spoofing Vulnerability"
    }
  ]
}