{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-41427","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-04-20T15:32:33.814Z","datePublished":"2026-04-24T19:23:20.161Z","dateUpdated":"2026-04-27T13:42:23.885Z"},"containers":{"cna":{"title":"Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients","problemTypes":[{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"references":[{"name":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6","tags":["x_refsource_CONFIRM"],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6"}],"affected":[{"vendor":"better-auth","product":"better-auth","versions":[{"version":">= 1.4.8-beta.7, < 1.6.5","status":"affected"},{"version":">= 1.7.0-beta.0, <= 1.7.0-beta.1","status":"affected"}]},{"vendor":"better-auth","product":"oauth-provider","versions":[{"version":">= 1.4.8-beta.7, < 1.6.5","status":"affected"},{"version":">= 1.7.0-beta.0, <= 1.7.0-beta.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-24T19:23:20.161Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-xr8f-h2gw-9xh6","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-27T13:42:15.023332Z","id":"CVE-2026-41427","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-27T13:42:23.885Z"}}]}}