GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-78519 (GCVE-0-2026-78519)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:18 – Updated: 2026-09-16 21:58
VLAI
Title
Microsoft Office Outlook Remote Code Execution Vulnerability
Summary
Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 04:21 UTC
CWE
  • CWE-908 - Use of Uninitialized Resource
References
Impacted products
Vendor Product Version CPE status
Microsoft Microsoft 365 Apps for Enterprise Affected: 16.0.1 , < 16.0.20326.20138 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Office 2019 Affected: 19.0.0 , < 16.0.10417.20207 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Office LTSC 2021 Affected: 16.0.1 , < 16.0.14334.20906 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Office LTSC 2024 Affected: 16.0.0 , < 16.0.17932.20976 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Outlook 2016 Affected: 16.0.0.0 , < 16.0.5569.1000 (custom)
guessed Create a notification for this product.
Date Public
2026-09-08 14:00
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-78519",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-09T04:21:20.817420Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-09T09:54:49.865Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Microsoft 365 Apps for Enterprise",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.20326.20138",
              "status": "affected",
              "version": "16.0.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Microsoft Office 2019",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.10417.20207",
              "status": "affected",
              "version": "19.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Microsoft Office LTSC 2021",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.14334.20906",
              "status": "affected",
              "version": "16.0.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Microsoft Office LTSC 2024",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.17932.20976",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Microsoft Outlook 2016",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.0.5569.1000",
              "status": "affected",
              "version": "16.0.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.0.10417.20207",
                  "versionStartIncluding": "19.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*",
                  "versionEndExcluding": "16.0.20326.20138",
                  "versionStartIncluding": "16.0.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*",
                  "versionEndExcluding": "16.0.14334.20906",
                  "versionStartIncluding": "16.0.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*",
                  "versionEndExcluding": "16.0.17932.20976",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:outlook_2016:*:*:*:*:*:x86:*:*",
                  "versionEndExcluding": "16.0.5569.1000",
                  "versionStartIncluding": "16.0.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-09-08T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908: Use of Uninitialized Resource",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T21:58:40.408Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Microsoft Office Outlook Remote Code Execution Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78519"
        }
      ],
      "title": "Microsoft Office Outlook Remote Code Execution Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-78519",
    "datePublished": "2026-09-08T17:18:37.311Z",
    "dateReserved": "2026-08-24T17:28:00.622Z",
    "dateUpdated": "2026-09-16T21:58:40.408Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-78519",
      "date": "2026-09-17",
      "epss": "0.00604",
      "percentile": "0.47415"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-08T07:00:00.000Z",
      "cve": "CVE-2026-78519",
      "id": "msrc_CVE-2026-78519",
      "initial_release_date": "2026-09-08T07:00:00.000Z",
      "product_status:fixed": "10",
      "product_status:known_affected": "10",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Microsoft Office Outlook Remote Code Execution Vulnerability",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-78519.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-78519\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2026-09-08T18:20:47.427\",\"lastModified\":\"2026-09-09T18:58:55.107\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.\"}],\"affected\":[{\"source\":\"secure@microsoft.com\",\"affectedData\":[{\"vendor\":\"Microsoft\",\"product\":\"Microsoft 365 Apps for Enterprise\",\"platforms\":[\"32-bit Systems\",\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.1\",\"lessThan\":\"16.0.20326.20138\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Office 2019\",\"platforms\":[\"32-bit Systems\",\"x64-based Systems\"],\"versions\":[{\"version\":\"19.0.0\",\"lessThan\":\"16.0.10417.20207\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Office LTSC 2021\",\"platforms\":[\"32-bit Systems\",\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.1\",\"lessThan\":\"16.0.14334.20906\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Office LTSC 2024\",\"platforms\":[\"32-bit Systems\",\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.0\",\"lessThan\":\"16.0.17932.20976\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Outlook 2016\",\"platforms\":[\"32-bit Systems\",\"x64-based Systems\"],\"versions\":[{\"version\":\"16.0.0.0\",\"lessThan\":\"16.0.5569.1000\",\"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:R/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-09T04:21:20.817420Z\",\"id\":\"CVE-2026-78519\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*\",\"matchCriteriaId\":\"3259EBFE-AE2D-48B8-BE9A-E22BBDB31378\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*\",\"matchCriteriaId\":\"CD25F492-9272-4836-832C-8439EBE64CCF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"241CDE2B-ABD0-4EFF-8D73-1766E32FA20F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"14D63E3F-A431-4DD8-979F-811E8DAC423D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*\",\"matchCriteriaId\":\"1D518075-3362-4D15-93B1-0E6C61518D16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*\",\"matchCriteriaId\":\"1059BEC6-C30B-4F0F-A878-5267A21CBD85\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*\",\"matchCriteriaId\":\"55A9AFDA-D77B-4CC7-ACE5-3A2ABDA257D8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*\",\"matchCriteriaId\":\"8887D177-26A3-4008-89B6-50A9E9830F13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x64:*\",\"matchCriteriaId\":\"0E6FF8E4-A3AF-4EC2-AAFD-D4FB80A3851A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:x86:*\",\"matchCriteriaId\":\"1E7C0D0D-7FE2-4FA4-AE4B-1B5D197BE982\"}]}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78519\",\"source\":\"secure@microsoft.com\",\"tags\":[\"Patch\",\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-78519\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-09T04:21:20.817420Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-09T09:53:12.965Z\"}}], \"cna\": {\"title\": \"Microsoft Office Outlook Remote Code Execution Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C\"}, \"scenarios\": [{\"lang\": \"en-US\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"vendor\": \"Microsoft\", \"product\": \"Microsoft 365 Apps for Enterprise\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.1\", \"lessThan\": \"16.0.20326.20138\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Office 2019\", \"versions\": [{\"status\": \"affected\", \"version\": \"19.0.0\", \"lessThan\": \"16.0.10417.20207\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Office LTSC 2021\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.1\", \"lessThan\": \"16.0.14334.20906\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Office LTSC 2024\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0\", \"lessThan\": \"16.0.17932.20976\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Outlook 2016\", \"versions\": [{\"status\": \"affected\", \"version\": \"16.0.0.0\", \"lessThan\": \"16.0.5569.1000\", \"versionType\": \"custom\"}], \"platforms\": [\"32-bit Systems\", \"x64-based Systems\"]}], \"datePublic\": \"2026-09-08T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78519\", \"name\": \"Microsoft Office Outlook Remote Code Execution Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Use of uninitialized resource in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-908\", \"description\": \"CWE-908: Use of Uninitialized Resource\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:office_2019:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.10417.20207\", \"versionStartIncluding\": \"19.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.20326.20138\", \"versionStartIncluding\": \"16.0.1\"}, {\"criteria\": \"cpe:2.3:a:microsoft:office_2021:*:*:*:*:long_term_servicing_channel:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.14334.20906\", \"versionStartIncluding\": \"16.0.1\"}, {\"criteria\": \"cpe:2.3:a:microsoft:office_2024:*:*:*:*:long_term_servicing_channel:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.17932.20976\", \"versionStartIncluding\": \"16.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:outlook_2016:*:*:*:*:*:x86:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"16.0.5569.1000\", \"versionStartIncluding\": \"16.0.0.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-09-15T22:43:36.518Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-78519\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-15T22:43:36.518Z\", \"dateReserved\": \"2026-08-24T17:28:00.622Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-09-08T17:18:37.311Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


Loading…