CVE-2026-77910

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77910", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "state": "PUBLISHED", "assignerShortName": "microsoft", "dateReserved": "2026-08-21T17:26:55.613Z", "datePublished": "2026-10-13T19:01:10.280Z", "dateUpdated": "2026-11-10T20:43:57.477Z"}, "containers": {"cna": {"title": "Microsoft Exchange Server Elevation of Privilege Vulnerability", "datePublic": "2026-10-13T14:00:00.000Z", "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.2562.056"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.1748.055"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*", "versionStartIncluding": "15.02.0.0", "versionEndExcluding": "15.02.1544.050"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*", "versionStartIncluding": "15.01.0.0", "versionEndExcluding": "15.01.2507.077"}]}]}], "affected": [{"vendor": "Microsoft", "product": "Microsoft Exchange Server 2016 Cumulative Update 23", "platforms": ["x64-based Systems"], "versions": [{"version": "15.01.0.0", "lessThan": "15.01.2507.077", "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": "15.02.1544.050", "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": "15.02.1748.055", "versionType": "custom", "status": "affected"}]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server Subscription Edition RTM", "platforms": ["x64-based Systems"], "versions": [{"version": "15.02.0.0", "lessThan": "15.02.2562.056", "versionType": "custom", "status": "affected"}]}], "descriptions": [{"value": "Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.", "lang": "en-US"}], "problemTypes": [{"descriptions": [{"description": "CWE-863: Incorrect Authorization", "lang": "en-US", "type": "CWE", "cweId": "CWE-863"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T20:43:57.477Z"}, "references": [{"name": "Microsoft Exchange Server Elevation of Privilege Vulnerability", "tags": ["vendor-advisory", "patch"], "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en-US", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "baseSeverity": "HIGH", "baseScore": 8.8, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"}}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-09T00:00:00+00:00", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3", "id": "CVE-2026-77910"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-14T03:58:33.231Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-77910", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-13T20:42:13.543600Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-13T20:42:14.240Z"}}], "cna": {"title": "Microsoft Exchange Server Elevation of Privilege Vulnerability", "metrics": [{"format": "CVSS", "cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/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 2016 Cumulative Update 23", "versions": [{"status": "affected", "version": "15.01.0.0", "lessThan": "15.01.2507.077", "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": "15.02.1544.050", "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": "15.02.1748.055", "versionType": "custom"}], "platforms": ["x64-based Systems"]}, {"vendor": "Microsoft", "product": "Microsoft Exchange Server Subscription Edition RTM", "versions": [{"status": "affected", "version": "15.02.0.0", "lessThan": "15.02.2562.056", "versionType": "custom"}], "platforms": ["x64-based Systems"]}], "datePublic": "2026-10-13T14:00:00.000Z", "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910", "name": "Microsoft Exchange Server Elevation of Privilege Vulnerability", "tags": ["vendor-advisory", "patch"]}], "descriptions": [{"lang": "en-US", "value": "Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network."}], "problemTypes": [{"descriptions": [{"lang": "en-US", "type": "CWE", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization"}]}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:microsoft:exchange_server_se:*:RTM:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.02.2562.056", "versionStartIncluding": "15.02.0.0"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_15:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.02.1748.055", "versionStartIncluding": "15.02.0.0"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server_2019:*:cumulative_update_14:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.02.1544.050", "versionStartIncluding": "15.02.0.0"}, {"criteria": "cpe:2.3:a:microsoft:exchange_server_2016:*:cumulative_update_23:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "15.01.2507.077", "versionStartIncluding": "15.01.0.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "shortName": "microsoft", "dateUpdated": "2026-11-10T20:43:57.477Z"}}}, "cveMetadata": {"cveId": "CVE-2026-77910", "state": "PUBLISHED", "dateUpdated": "2026-11-10T20:43:57.477Z", "dateReserved": "2026-08-21T17:26:55.613Z", "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8", "datePublished": "2026-10-13T19:01:10.280Z", "assignerShortName": "microsoft"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"platforms": ["x64-based Systems"], "product": "Microsoft Exchange Server 2016 Cumulative Update 23", "vendor": "Microsoft", "versions": [{"lessThan": "15.01.2507.077", "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": "15.02.1544.050", "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": "15.02.1748.055", "status": "affected", "version": "15.02.0.0", "versionType": "custom"}]}, {"platforms": ["x64-based Systems"], "product": "Microsoft Exchange Server Subscription Edition RTM", "vendor": "Microsoft", "versions": [{"lessThan": "15.02.2562.056", "status": "affected", "version": "15.02.0.0", "versionType": "custom"}]}], "source": "secure@microsoft.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network."}], "id": "CVE-2026-77910", "lastModified": "2026-10-14T04:18:36.717", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "secure@microsoft.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77910", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-09T00:00:00+00:00", "version": "2.0.3"}}]}, "published": "2026-10-13T19:19:54.057", "references": [{"source": "secure@microsoft.com", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910"}], "sourceIdentifier": "secure@microsoft.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "secure@microsoft.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.01.0.0,15.01.2507.077)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "exchange_server_2016", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1544.050)"}}, {"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1748.055)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "exchange_server_2019", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.2562.056)"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "exchange_server_se", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.01.0.0,15.01.2507.077)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2016 Cumulative Update 23", "source": "cna", "vendor": "Microsoft"}, "product": "microsoft_exchange_server_2016_cumulative_update_23", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1544.050)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2019 Cumulative Update 14", "source": "cna", "vendor": "Microsoft"}, "product": "microsoft_exchange_server_2019_cumulative_update_14", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.1748.055)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server 2019 Cumulative Update 15", "source": "cna", "vendor": "Microsoft"}, "product": "microsoft_exchange_server_2019_cumulative_update_15", "vendor": "microsoft"}, {"configurations": [{"platform": ["x64-based_systems"], "status": "affected", "versions": {"scheme": "generic", "value": "[15.02.0.0,15.02.2562.056)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Microsoft Exchange Server Subscription Edition RTM", "source": "cna", "vendor": "Microsoft"}, "product": "microsoft_exchange_server_subscription_edition_rtm", "vendor": "microsoft"}], "created": "2026-10-14T03:00:12.228493+00:00", "updated": "2026-10-14T19:00:07.225855+00:00", "vendors": ["microsoft", "microsoft$PRODUCT$exchange_server_2016", "microsoft$PRODUCT$exchange_server_2019", "microsoft$PRODUCT$exchange_server_se", "microsoft$PRODUCT$microsoft_exchange_server_2016_cumulative_update_23", "microsoft$PRODUCT$microsoft_exchange_server_2019_cumulative_update_14", "microsoft$PRODUCT$microsoft_exchange_server_2019_cumulative_update_15", "microsoft$PRODUCT$microsoft_exchange_server_subscription_edition_rtm"]}