{"api_version":"1","generated_at":"2026-09-17T07:50:28+00:00","cve":"CVE-2026-20306","urls":{"html":"https://cve.report/CVE-2026-20306","api":"https://cve.report/api/cve/CVE-2026-20306.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-20306","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-20306"},"summary":{"title":"Cisco Identity Services Engine Command Injection Vulnerability","description":"A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.","state":"PUBLISHED","assigner":"cisco","published_at":"2026-09-16 17:17:16","updated_at":"2026-09-17 04:17:40"},"problem_types":["CWE-78","CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"],"metrics":[{"version":"3.1","source":"psirt@cisco.com","type":"Secondary","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSSV3_1","score":"9.1","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cmd-inj-e2CuZCYZ","name":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cmd-inj-e2CuZCYZ","refsource":"psirt@cisco.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-20306","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20306","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Cisco","product":"Cisco Identity Services Engine Software","version":"affected 3.4 Patch 4","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Identity Services Engine Software","version":"affected 3.4 Patch 5","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Identity Services Engine Software","version":"affected 3.5 Patch 3","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco Identity Services Engine Software","version":"affected 3.4 Patch 6","platforms":[]},{"source":"CNA","vendor":"Cisco","product":"Cisco ISE Passive Identity Connector","version":"affected 3.4.0","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[{"source":"CNA","title":"","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.","time":"","lang":"en"}],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-20306","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2026-09-16T00:00:00+00:00","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-09-17T03:57:23.320Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unknown","product":"Cisco Identity Services Engine Software","vendor":"Cisco","versions":[{"status":"affected","version":"3.4 Patch 4"},{"status":"affected","version":"3.4 Patch 5"},{"status":"affected","version":"3.5 Patch 3"},{"status":"affected","version":"3.4 Patch 6"}]},{"defaultStatus":"unknown","product":"Cisco ISE Passive Identity Connector","vendor":"Cisco","versions":[{"status":"affected","version":"3.4.0"}]}],"descriptions":[{"lang":"en","value":"A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored."}],"exploits":[{"lang":"en","value":"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"cvssV3_1"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","description":"Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"cwe"}]}],"providerMetadata":{"dateUpdated":"2026-09-16T20:05:43.119Z","orgId":"d1c1063e-7a18-46af-9102-31f8928bc633","shortName":"cisco"},"references":[{"name":"cisco-sa-ise-cmd-inj-e2CuZCYZ","url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-cmd-inj-e2CuZCYZ"}],"source":{"advisory":"cisco-sa-ise-cmd-inj-e2CuZCYZ","defects":["CSCwu26077"],"discovery":"INTERNAL"},"title":"Cisco Identity Services Engine Command Injection Vulnerability"}},"cveMetadata":{"assignerOrgId":"d1c1063e-7a18-46af-9102-31f8928bc633","assignerShortName":"cisco","cveId":"CVE-2026-20306","datePublished":"2026-09-16T16:55:11.334Z","dateReserved":"2025-10-08T11:59:15.408Z","dateUpdated":"2026-09-17T03:57:23.320Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 17:17:16","lastModifiedDate":"2026-09-17 04:17:40","problem_types":["CWE-78","CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')"],"metrics":{"cvssMetricV31":[{"source":"psirt@cisco.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.3,"impactScore":6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-16T00:00:00+00:00","id":"CVE-2026-20306","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"20306","Ordinal":"1","Title":"Cisco Identity Services Engine Command Injection Vulnerability","CVE":"CVE-2026-20306","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"20306","Ordinal":"1","NoteData":"A vulnerability in the REST API of Cisco ISE and ISE-PIC could allow an authenticated, remote attacker to perform command injection attacks on the underlying operating system and elevate privileges to root. To exploit this vulnerability, the attacker must have valid administrative credentials.\r\n\r\nThis vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending crafted commands to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary code on the device and elevate privileges to root. In single-node deployments, successful exploitation of this vulnerability could cause the affected ISE node to become unavailable, resulting in a DoS condition. In that condition, endpoints that have not already authenticated would be unable to access the network until the node is restored.","Type":"Description","Title":"Cisco Identity Services Engine Command Injection Vulnerability"}]}}}