{"cve":{"cve_id":"CVE-2026-66842","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.0028,"epss_percentile":0.2044,"epss_as_of":"2026-09-15","description":"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.","published_at":"2026-09-02T15:40:53.769000Z","last_modified_at":"2026-09-03T13:06:01.337000Z","cvss_v3_score":8.8,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":8.7,"cvss_v4_vector":"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","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-918"],"nvd_references":["https://my.f5.com/manage/s/article/K000162521"],"vuln_status":"Undergoing Analysis","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-09-02T21:35:30.381140Z","updated_at":"2026-09-05T03:43:45.382026Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"21.1.0","version_start_inclusive":true,"version_end":"21.1.0.1","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:21.1.0:21.1.0.1"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"21.0.0","version_start_inclusive":true,"version_end":"21.0.0.3","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:21.0.0:21.0.0.3"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"17.5.0","version_start_inclusive":true,"version_end":"17.5.1.8","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:17.5.0:17.5.1.8"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-ip","product_name":"BIG-IP","version_start":"17.1.0","version_start_inclusive":true,"version_end":"17.1.3.4","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-ip:17.1.0:17.1.3.4"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"big-iq","product_name":"BIG-IQ","version_start":"8.4.0","version_start_inclusive":true,"version_end":"8.4.2.1","version_end_inclusive":false,"cpe23_uri":"cve5:f5:big-iq:8.4.0:8.4.2.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://my.f5.com/manage/s/article/K000162521","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-09-02T15:40:53.769000Z","label":"CVE published","source":null}]}