{"id":"CVE-2026-41427","sourceIdentifier":"security-advisories@github.com","published":"2026-04-24T20:16:27.390","lastModified":"2026-06-17T10:46:42.600","vulnStatus":"Analyzed","cveTags":[],"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"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"}]}]}],"metrics":{"cvssMetricV40":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","baseScore":6.5,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.8,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-27T13:42:15.023332Z","id":"CVE-2026-41427","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-863"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*","versionStartIncluding":"1.4.9","versionEndExcluding":"1.6.5","matchCriteriaId":"CE35ECEB-5E33-41B9-B2D1-E45759AF936E"},{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.4.8:-:*:*:*:node.js:*:*","matchCriteriaId":"6DA5C22B-C161-46D4-945E-3041EFA2376C"},{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.4.8:beta7:*:*:*:node.js:*:*","matchCriteriaId":"823F67C9-1A4F-4491-B4F1-CE9BB49BA6EC"},{"vulnerable":true,"criteria":"cpe:2.3:a:better-auth:better-auth\\/oauth-provider:1.7.0:beta0:*:*:*:node.js:*:*","matchCriteriaId":"69DC1E8F-2C5D-4D63-A054-B26028655FD2"}]}]}],"references":[{"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-xr8f-h2gw-9xh6","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}