{"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":"2026-09-03T03:56:29.619Z"},"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":"2026-09-02T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-66842"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-03T03:56:29.619Z"}}]}}