{
  "document": {
    "acknowledgments": [
      {
        "names": [
          "Benoit Sevens using Claude with Anthropic"
        ]
      },
      {
        "names": [
          "nono"
        ]
      }
    ],
    "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-2026-124194 Microsoft Outlook Spoofing Vulnerability - HTML",
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-124194"
      },
      {
        "category": "self",
        "summary": "CVE-2026-124194 Microsoft Outlook Spoofing Vulnerability - CSAF",
        "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-124194.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 Outlook Spoofing Vulnerability",
    "tracking": {
      "current_release_date": "2026-11-10T08:00:00.000Z",
      "generator": {
        "date": "2026-11-13T22:46:06.480Z",
        "engine": {
          "name": "MSRC Generator",
          "version": "1.0"
        }
      },
      "id": "msrc_CVE-2026-124194",
      "initial_release_date": "2026-11-10T08:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-11-10T08:00:00.000Z",
          "legacy_version": "1",
          "number": "1",
          "summary": "Information published."
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
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      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<16.0.14334.21048",
                "product": {
                  "name": "Microsoft Office LTSC 2021 for 64-bit editions <16.0.14334.21048",
                  "product_id": "4"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.14334.21048",
                "product": {
                  "name": "Microsoft Office LTSC 2021 for 64-bit editions 16.0.14334.21048",
                  "product_id": "11952"
                }
              }
            ],
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          },
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                "category": "product_version_range",
                "name": "<16.0.14334.21048",
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              },
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                "name": "16.0.14334.21048",
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                "product": {
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                  "product_id": "1"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.17932.21140",
                "product": {
                  "name": "Microsoft Office LTSC 2024 for 64-bit editions 16.0.17932.21140",
                  "product_id": "12421"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft Office LTSC 2024 for 64-bit editions"
          },
          {
            "branches": [
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                "name": "<16.0.17932.21140",
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                  "product_id": "2"
                }
              },
              {
                "category": "product_version",
                "name": "16.0.17932.21140",
                "product": {
                  "name": "Microsoft Office LTSC 2024 for 32-bit editions 16.0.17932.21140",
                  "product_id": "12420"
                }
              }
            ],
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            "name": "Microsoft Office LTSC 2024 for 32-bit editions"
          },
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "<https://aka.ms/OfficeSecurityReleases",
                "product": {
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                  "product_id": "5"
                }
              },
              {
                "category": "product_version",
                "name": "https://aka.ms/OfficeSecurityReleases",
                "product": {
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                  "product_id": "11763"
                }
              }
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                }
              },
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                "name": "https://aka.ms/OfficeSecurityReleases",
                "product": {
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                  "product_id": "11762"
                }
              }
            ],
            "category": "product_name",
            "name": "Microsoft 365 Apps for Enterprise for 32-bit Systems"
          }
        ],
        "category": "vendor",
        "name": "Microsoft"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-124194",
      "cwe": {
        "id": "CWE-356",
        "name": "Product UI does not Warn User of Unsafe Actions"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "An unauthenticated attacker could send a specially crafted message file and convince a user to open it in an affected version of Microsoft Outlook. Opening the file could cause Outlook to connect to an attacker-controlled network location without displaying the usual external-content warning, potentially disclosing authentication information that could be used to impersonate the user. Exploitation requires network connectivity and user interaction.",
          "title": "How could an attacker exploit this vulnerability?"
        },
        {
          "category": "faq",
          "text": "No, the Preview Pane is not an attack vector.",
          "title": "Is the Preview Pane an attack vector for this vulnerability?"
        },
        {
          "category": "faq",
          "text": "An attacker must send a user a malicious Office file and convince them to open it.",
          "title": "According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?"
        },
        {
          "category": "faq",
          "text": "This vulnerability discloses a user's NTLMv2 hash to the attacker who could use this to authenticate as the user.",
          "title": "According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H). What does that mean for this vulnerability?"
        }
      ],
      "product_status": {
        "fixed": [
          "11762",
          "11763",
          "11952",
          "11953",
          "12420",
          "12421"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-124194 Microsoft Outlook Spoofing Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-124194"
        },
        {
          "category": "self",
          "summary": "CVE-2026-124194 Microsoft Outlook Spoofing Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-124194.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T08:00:00.000Z",
          "details": "16.0.14334.21048:Security Update:https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates",
          "product_ids": [
            "4",
            "3"
          ],
          "url": "https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"
        },
        {
          "category": "vendor_fix",
          "date": "2026-11-10T08:00:00.000Z",
          "details": "16.0.17932.21140:Security Update:https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates",
          "product_ids": [
            "1",
            "2"
          ],
          "url": "https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"
        },
        {
          "category": "vendor_fix",
          "date": "2026-11-10T08:00:00.000Z",
          "details": "https://aka.ms/OfficeSecurityReleases:Security Update:https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates",
          "product_ids": [
            "5",
            "6"
          ],
          "url": "https://learn.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "exploitCodeMaturity": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 6.2,
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Spoofing"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:Yes;Latest Software Release:Exploitation Detected"
        }
      ],
      "title": "Microsoft Outlook Spoofing Vulnerability"
    }
  ]
}