{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-55007", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-06-16T14:12:44.283Z", "datePublished": "2026-09-08T17:10:39.617Z", "dateUpdated": "2026-09-08T18:30:45.749Z"}, "containers": {"cna": {"title": "Microsoft Exchange Server Remote Code Execution Vulnerability", "datePublic": "2026-09-08T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.1544.046"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.1748.051"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.2562.049"}]}]}], "affected": [{"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"}]}], "descriptions": [{"value": "Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-415: Double Free", "lang": "en-US", "type": "CWE", "cweId": "CWE-415"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-09-08T18:30:45.749Z"}, "references": [{"name": "Microsoft Exchange Server Remote Code Execution Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 8.1, "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"}}]}}}

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{"affected": [{"affectedData": [{"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"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network."}], "id": "CVE-2026-55007", "lastModified": "2026-09-08T18:39:13.460", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Primary"}]}, "published": "2026-09-08T18:17:41.820", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "secure@microsoft.com", "type": "Primary"}]}

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