{"cve":{"cve_id":"CVE-2026-41427","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":0.00212,"epss_percentile":0.11335,"epss_as_of":"2026-06-23","description":"Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.","published_at":"2026-04-24T19:23:20.161000Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":7.1,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/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://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6"],"vuln_status":null,"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":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:16.364334Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"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":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"H","value_label":"High"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"N","value_label":"None"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"L","value_label":"Low"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"better-auth","vendor_name":"better-auth","product_slug":"better-auth","product_name":"better-auth","version_start":">= 1.4.8-beta.7, < 1.6.5","version_start_inclusive":true,"version_end":">= 1.4.8-beta.7, < 1.6.5","version_end_inclusive":true,"cpe23_uri":"cve5:better-auth:better-auth:>= 1.4.8-beta.7, < 1.6.5:>= 1.4.8-beta.7, < 1.6.5"},{"vendor_slug":"better-auth","vendor_name":"better-auth","product_slug":"better-auth","product_name":"better-auth","version_start":">= 1.7.0-beta.0, <= 1.7.0-beta.1","version_start_inclusive":true,"version_end":">= 1.7.0-beta.0, <= 1.7.0-beta.1","version_end_inclusive":true,"cpe23_uri":"cve5:better-auth:better-auth:>= 1.7.0-beta.0, <= 1.7.0-beta.1:>= 1.7.0-beta.0, <= 1.7.0-beta.1"},{"vendor_slug":"better-auth","vendor_name":"better-auth","product_slug":"oauth-provider","product_name":"oauth-provider","version_start":">= 1.4.8-beta.7, < 1.6.5","version_start_inclusive":true,"version_end":">= 1.4.8-beta.7, < 1.6.5","version_end_inclusive":true,"cpe23_uri":"cve5:better-auth:oauth-provider:>= 1.4.8-beta.7, < 1.6.5:>= 1.4.8-beta.7, < 1.6.5"},{"vendor_slug":"better-auth","vendor_name":"better-auth","product_slug":"oauth-provider","product_name":"oauth-provider","version_start":">= 1.7.0-beta.0, <= 1.7.0-beta.1","version_start_inclusive":true,"version_end":">= 1.7.0-beta.0, <= 1.7.0-beta.1","version_end_inclusive":true,"cpe23_uri":"cve5:better-auth:oauth-provider:>= 1.7.0-beta.0, <= 1.7.0-beta.1:>= 1.7.0-beta.0, <= 1.7.0-beta.1"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2026-04-24T19:23:20.161000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:54:01.174321Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:01.174321Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:54:01.174321Z","label":"CVSS score revised","source":"cvelistv5"}]}