CVE-2026-69378

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-69378", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-03T20:54:04.486Z", "datePublished": "2026-09-08T17:12:46.915Z", "dateUpdated": "2026-11-10T21:31:32.231Z"}, "containers": {"cna": {"title": "Microsoft Exchange Server Denial of Service 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_2016:*:cumulative_update_23:*:*:*:*:*:*", "versionStartIncluding": "15.01.0.0", "versionEndExcluding": "15.01.2507.073"}, {"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_se:*:RTM:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.2562.049"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.1748.051"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Exchange Server 2016 Cumulative Update 23", "platforms": ["x64-based Systems"], "versions": [{"version": "15.01.0.0", "lessThan": "15.01.2507.073", "versionType": "custom", "status": "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": "Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-674: Uncontrolled Recursion", "lang": "en-US", "type": "CWE", "cweId": "CWE-674"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T21:31:32.231Z"}, "references": [{"name": "Microsoft Exchange Server Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-08T20:41:18.591112Z", "id": "CVE-2026-69378", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T20:54:51.395Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-69378", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-08T20:41:18.591112Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-08T20:54:45.768Z"}}], "cna": {"title": "Microsoft Exchange Server Denial of Service Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C"}, "scenarios": [{"lang": "en-US", "value": "GENERAL"}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Exchange Server 2016 Cumulative Update 23", "versions": [{"status": "affected", "version": "15.01.0.0", "lessThan": "15.01.2507.073", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"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-2026-69378", "name": "Microsoft Exchange Server Denial of Service Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-674", "description": "CWE-674: Uncontrolled Recursion"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.01.2507.073", "versionStartIncluding": "15.01.0.0"}, {"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_se:*:RTM:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.02.2562.049", "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"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T21:31:32.231Z"}}}, "cveMetadata": {"cveId": "CVE-2026-69378", "state": "PUBLISHED", "dateUpdated": "2026-11-10T21:31:32.231Z", "dateReserved": "2026-08-03T20:54:04.486Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-09-08T17:12:46.915Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"platforms": ["x64-based Systems"], "product": "Microsoft Exchange Server 2016 Cumulative Update 23", "vendor": "Microsoft", "versions": [{"lessThan": "15.01.2507.073", "status": "affected", "version": "15.01.0.0", "versionType": "custom"}]}, {"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"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_23:*:*:*:*:*:*", "matchCriteriaId": "FF76AEDA-E574-40ED-B64F-8FDEF8CAC802", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_14:*:*:*:*:*:*", "matchCriteriaId": "8C98993B-82A5-48CC-947F-896CEA0CDB7F", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_15:*:*:*:*:*:*", "matchCriteriaId": "7166BCE0-1D55-46B2-96B9-250AB4BB6291", "vulnerable": true}, {"criteria": "cpe:2.3:a:microsoft:exchange_server_subscription_edition:*:*:*:*:*:*:*:*", "matchCriteriaId": "DFE6E02B-98D8-4797-B4CB-E48E2F193344", "versionEndExcluding": "15.02.2562.049", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network."}], "id": "CVE-2026-69378", "lastModified": "2026-09-29T15:54:45.013", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-69378", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T20:41:18.591112Z", "version": "2.0.3"}}]}, "published": "2026-09-08T18:18:58.543", "references": [{"source": "secure@microsoft.com", "tags": ["Patch", "Vendor Advisory"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.01.0.0,15.01.2507.073)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2016 Cumulative Update 23", "source": "cna", "vendor": "Microsoft"}, "product": "exchange_server_2016", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1544.046)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2019 Cumulative Update 14", "source": "cna", "vendor": "Microsoft"}, "product": "exchange_server_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1748.051)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2019 Cumulative Update 15", "source": "cna", "vendor": "Microsoft"}, "product": "exchange_server_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.2562.049)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server Subscription Edition RTM", "source": "cna", "vendor": "Microsoft"}, "product": "exchange_server_se", "vendor": "microsoft"}], "created": "2026-09-08T21:30:17.129409+00:00", "updated": "2026-09-09T23:30:09.734627+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$exchange_server_2016", "microsoft$PRODUCT$exchange_server_2019", "microsoft$PRODUCT$exchange_server_se"]}