{"cve":{"cve_id":"CVE-2026-103903","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":0.00415,"epss_percentile":0.34234,"epss_as_of":"2026-10-15","description":"An incorrect authorization vulnerability in the WinBox\nauthentication flow of MikroTik RouterOS allows a remote authenticated attacker\nwith credentials for a low-privilege account permitted to use WinBox to obtain\nthe authorization policy of a different existing account. The stage-one EC-SRP\nchallenge and proof are verified using the attacker's account, while the\nindependently supplied stage-two username is used to install the target\naccount's privileges. By specifying a higher-privilege account such as admin, a\nlow-privilege user can obtain a full administrative session without knowing the\ntarget account's password and can use that session to increase the privileges\nof the attacker's own account.","published_at":"2026-10-12T10:37:23.578000Z","last_modified_at":"2026-10-16T17:25:57.940000Z","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":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-863"],"nvd_references":["https://mikrotik.com/download/changelogs?channelFilter=stable&versionFilter=7.24.5","https://forum.mikrotik.com/t/7-25rc1-testing-is-released/27352","https://br2sec.com/lv/resursi/2026-routeros-winbox-auth-bypass/","https://cvd.cert.lv/disclosed/vuln-all-709639748"],"vuln_status":"Awaiting 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":"2026-10-12T10:59:39.157674Z","updated_at":"2026-10-20T02:20:54.235708Z"},"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":"mikrotik","vendor_name":"MikroTik","product_slug":"routeros","product_name":"RouterOS","version_start":"7.0.0","version_start_inclusive":true,"version_end":"7.24.5","version_end_inclusive":false,"cpe23_uri":"cve5:mikrotik:routeros:7.0.0:7.24.5"},{"vendor_slug":"mikrotik","vendor_name":"MikroTik","product_slug":"routeros","product_name":"RouterOS","version_start":"7.25rc1","version_start_inclusive":true,"version_end":"7.25rc1","version_end_inclusive":true,"cpe23_uri":"cve5:mikrotik:routeros:7.25rc1:7.25rc1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://mikrotik.com/download/changelogs?channelFilter=stable&versionFilter=7.24.5","source_type":"MISC","tags":[]},{"url":"https://forum.mikrotik.com/t/7-25rc1-testing-is-released/27352","source_type":"MISC","tags":[]},{"url":"https://br2sec.com/lv/resursi/2026-routeros-winbox-auth-bypass/","source_type":"MISC","tags":[]},{"url":"https://cvd.cert.lv/disclosed/vuln-all-709639748","source_type":"MISC","tags":[]}],"timeline":[{"type":"published","at":"2026-10-12T10:37:23.578000Z","label":"CVE published","source":null}]}