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

CVE-2026-55007 (GCVE-0-2026-55007)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:10 – Updated: 2026-09-09 21:27
VLAI
Title
Microsoft Exchange Server Remote Code Execution Vulnerability
Summary
Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 04:20 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Microsoft Microsoft Exchange Server 2019 Cumulative Update 14 Affected: 15.02.0.0 , < 15.02.1544.046 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Exchange Server 2019 Cumulative Update 15 Affected: 15.02.0.0 , < 15.02.1748.051 (custom)
guessed Create a notification for this product.
Microsoft Microsoft Exchange Server Subscription Edition RTM Affected: 15.02.0.0 , < 15.02.2562.049 (custom)
guessed Create a notification for this product.
Date Public
2026-09-08 14:00
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-55007",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-09T04:20:19.366481Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-09T10:05:47.294Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.1544.046",
              "status": "affected",
              "version": "15.02.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server 2019 Cumulative Update 15",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.1748.051",
              "status": "affected",
              "version": "15.02.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Microsoft Exchange Server Subscription Edition RTM",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.02.2562.049",
              "status": "affected",
              "version": "15.02.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*",
                  "versionEndExcluding": "15.02.1544.046",
                  "versionStartIncluding": "15.02.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*",
                  "versionEndExcluding": "15.02.1748.051",
                  "versionStartIncluding": "15.02.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*",
                  "versionEndExcluding": "15.02.2562.049",
                  "versionStartIncluding": "15.02.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-09-08T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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-415",
              "description": "CWE-415: Double Free",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-09T21:27:40.931Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Microsoft Exchange Server Remote Code Execution Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007"
        }
      ],
      "title": "Microsoft Exchange Server Remote Code Execution Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-55007",
    "datePublished": "2026-09-08T17:10:39.617Z",
    "dateReserved": "2026-06-16T14:12:44.283Z",
    "dateUpdated": "2026-09-09T21:27:40.931Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-55007",
      "date": "2026-09-09",
      "epss": "0.00726",
      "percentile": "0.51992"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-08T07:00:00.000Z",
      "cve": "CVE-2026-55007",
      "id": "msrc_CVE-2026-55007",
      "initial_release_date": "2026-09-08T07:00:00.000Z",
      "product_status:fixed": "3",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Microsoft Exchange Server Remote Code Execution Vulnerability",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-55007.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55007\",\"sourceIdentifier\":\"secure@microsoft.com\",\"published\":\"2026-09-08T18:17:41.820\",\"lastModified\":\"2026-09-09T10:17:06.033\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.\"}],\"affected\":[{\"source\":\"secure@microsoft.com\",\"affectedData\":[{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Exchange Server 2019 Cumulative Update 14\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"15.02.0.0\",\"lessThan\":\"15.02.1544.046\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Exchange Server 2019 Cumulative Update 15\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"15.02.0.0\",\"lessThan\":\"15.02.1748.051\",\"versionType\":\"custom\",\"status\":\"affected\"}]},{\"vendor\":\"Microsoft\",\"product\":\"Microsoft Exchange Server Subscription Edition RTM\",\"platforms\":[\"x64-based Systems\"],\"versions\":[{\"version\":\"15.02.0.0\",\"lessThan\":\"15.02.2562.049\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"secure@microsoft.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-09T04:20:19.366481Z\",\"id\":\"CVE-2026-55007\",\"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-415\"}]}],\"references\":[{\"url\":\"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007\",\"source\":\"secure@microsoft.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Microsoft Exchange Server Remote Code Execution Vulnerability\", \"metrics\": [{\"format\": \"CVSS\", \"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 8.1, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/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 Exchange Server 2019 Cumulative Update 14\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.02.0.0\", \"lessThan\": \"15.02.1544.046\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server 2019 Cumulative Update 15\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.02.0.0\", \"lessThan\": \"15.02.1748.051\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}, {\"vendor\": \"Microsoft\", \"product\": \"Microsoft Exchange Server Subscription Edition RTM\", \"versions\": [{\"status\": \"affected\", \"version\": \"15.02.0.0\", \"lessThan\": \"15.02.2562.049\", \"versionType\": \"custom\"}], \"platforms\": [\"x64-based Systems\"]}], \"datePublic\": \"2026-09-08T14:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007\", \"name\": \"Microsoft Exchange Server Remote Code Execution Vulnerability\", \"tags\": [\"vendor-advisory\", \"patch\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-415\", \"description\": \"CWE-415: Double Free\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.1544.046\", \"versionStartIncluding\": \"15.02.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.1748.051\", \"versionStartIncluding\": \"15.02.0.0\"}, {\"criteria\": \"cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"15.02.2562.049\", \"versionStartIncluding\": \"15.02.0.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"shortName\": \"microsoft\", \"dateUpdated\": \"2026-09-08T23:33:44.774Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55007\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-09T04:20:19.366481Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-09-09T10:04:54.290Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-55007\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-08T23:33:44.774Z\", \"dateReserved\": \"2026-06-16T14:12:44.283Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-09-08T17:10:39.617Z\", \"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.