{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66842", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-07-29T19:42:42.204Z", "datePublished": "2026-09-02T15:40:53.769Z", "dateUpdated": "2026-09-02T17:56:25.522Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unknown", "modules": ["ALL"], "product": "BIG-IP", "vendor": "F5", "versions": [{"lessThan": "21.1.0.1", "status": "affected", "version": "21.1.0", "versionType": "custom"}, {"lessThan": "21.0.0.3", "status": "affected", "version": "21.0.0", "versionType": "custom"}, {"lessThan": "17.5.1.8", "status": "affected", "version": "17.5.0", "versionType": "custom"}, {"lessThan": "17.1.3.4", "status": "affected", "version": "17.1.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "modules": ["TMOS"], "product": "BIG-IQ", "vendor": "F5", "versions": [{"lessThan": "8.4.2.1", "status": "affected", "version": "8.4.0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "F5 acknowledges Dan Stefan Alexandru of Pentest-Tools for bringing this issue to our attention and following the highest standards of coordinated disclosure."}], "datePublic": "2026-08-19T14:00:00.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<div>BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI).</div><div><br></div><div>Impact:</div><div>This vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only.</div><div><br></div><div>Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.</div>"}], "value": "BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI).\n\n\n\n\nImpact:\n\nThis vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "metrics": [{"cvssV3_1": {"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"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "baseScore": 8.7, "baseSeverity": "HIGH", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-09-02T15:40:53.769Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://my.f5.com/manage/s/article/K000162521"}], "source": {"discovery": "EXTERNAL"}, "title": "BIG-IP and BIG-IQ Configuration utility vulnerability", "workarounds": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "None"}], "value": "None"}], "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-02T17:56:18.439853Z", "id": "CVE-2026-66842", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-02T17:56:25.522Z"}}]}}

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