{"id":"CVE-2026-53517","summary":"Better Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay and Token Family Forking","details":"Better Auth is an authentication and authorization library for TypeScript. From 1.4.8-beta.7 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint on the refresh_token grant performs a non-atomic read, validate, revoke, and mint sequence on the oauthRefreshToken row, allowing concurrent requests with the same parent refresh token to pass the revoked check and create forked refresh-token families; the vulnerable range also includes embedded better-auth plugin versions before 1.6.0. This issue is fixed in version 1.6.11.","aliases":["GHSA-392p-2q2v-4372"],"modified":"2026-08-12T03:51:26.273058086Z","published":"2026-07-15T17:33:38.943Z","database_specific":{"cwe_ids":["CWE-362","CWE-367"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53517.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/better-auth/better-auth/releases/tag/v1.6.11"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53517.json"},{"type":"ADVISORY","url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53517"},{"type":"FIX","url":"https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/better-auth/better-auth","events":[{"introduced":"0e3f188020fa785d44d0019a3a3c8407a4cc8d5f"},{"fixed":"f41514ef07cfafc5dbf463bd1500aee6575d88a7"},{"introduced":"35fcd1aa89b6e9978d7b34ec971066d6a8f1e4e3"},{"fixed":"f41514ef07cfafc5dbf463bd1500aee6575d88a7"},{"introduced":"148b32e0cb5e143d31f070eaa2781d0cf471b928"},{"fixed":"c6918ecc9e3a75892169415d7f6c95b591b6a52d"}],"database_specific":{"cpe":["cpe:2.3:a:better-auth:better-auth\\/oauth-provider:*:*:*:*:*:node.js:*:*","cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*","cpe:2.3:a:better-auth:better_auth:1.4.8:-:*:*:*:node.js:*:*"],"extracted_events":[{"introduced":"1.6.0"},{"fixed":"1.6.11"},{"introduced":"1.4.9"},{"introduced":"1.4.8-NA"},{"last_affected":"1.4.8-NA"}],"source":["CPE_RANGE","CPE_STRING","REFERENCES"]}}],"versions":["1.4.8-NA","v1.6.10","better-auth@1.6.10","auth@1.6.10","@better-auth/test-utils@1.6.10","@better-auth/telemetry@1.6.10","@better-auth/stripe@1.6.10","@better-auth/sso@1.6.10","@better-auth/scim@1.6.10","@better-auth/redis-storage@1.6.10","@better-auth/prisma-adapter@1.6.10","@better-auth/passkey@1.6.10","@better-auth/oauth-provider@1.6.10","@better-auth/mongo-adapter@1.6.10","@better-auth/memory-adapter@1.6.10","@better-auth/kysely-adapter@1.6.10","@better-auth/i18n@1.6.10","@better-auth/expo@1.6.10","@better-auth/electron@1.6.10","@better-auth/drizzle-adapter@1.6.10","@better-auth/core@1.6.10","@better-auth/api-key@1.6.10","v1.6.9","better-auth@1.6.9","auth@1.6.9","@better-auth/test-utils@1.6.9","@better-auth/telemetry@1.6.9","@better-auth/stripe@1.6.9","@better-auth/sso@1.6.9","@better-auth/scim@1.6.9","@better-auth/redis-storage@1.6.9","@better-auth/prisma-adapter@1.6.9","@better-auth/passkey@1.6.9","@better-auth/oauth-provider@1.6.9","@better-auth/mongo-adapter@1.6.9","@better-auth/memory-adapter@1.6.9","@better-auth/kysely-adapter@1.6.9","@better-auth/i18n@1.6.9","@better-auth/expo@1.6.9","@better-auth/electron@1.6.9","@better-auth/drizzle-adapter@1.6.9","@better-auth/core@1.6.9","@better-auth/api-key@1.6.9","v1.6.8","better-auth@1.6.8","auth@1.6.8","@better-auth/test-utils@1.6.8","@better-auth/telemetry@1.6.8","@better-auth/stripe@1.6.8","@better-auth/sso@1.6.8","@better-auth/scim@1.6.8","@better-auth/redis-storage@1.6.8","@better-auth/prisma-adapter@1.6.8","@better-auth/passkey@1.6.8","@better-auth/oauth-provider@1.6.8","@better-auth/mongo-adapter@1.6.8","@better-auth/memory-adapter@1.6.8","@better-auth/kysely-adapter@1.6.8","@better-auth/i18n@1.6.8","@better-auth/expo@1.6.8","@better-auth/electron@1.6.8","@better-auth/drizzle-adapter@1.6.8","@better-auth/core@1.6.8","@better-auth/api-key@1.6.8","v1.6.7","better-auth@1.6.7","auth@1.6.7","@better-auth/test-utils@1.6.7","@better-auth/telemetry@1.6.7","@better-auth/stripe@1.6.7","@better-auth/sso@1.6.7","@better-auth/scim@1.6.7","@better-auth/redis-storage@1.6.7","@better-auth/prisma-adapter@1.6.7","@better-auth/passkey@1.6.7","@better-auth/oauth-provider@1.6.7","@better-auth/mongo-adapter@1.6.7","@better-auth/memory-adapter@1.6.7","@better-auth/kysely-adapter@1.6.7","@better-auth/i18n@1.6.7","@better-auth/expo@1.6.7","@better-auth/electron@1.6.7","@better-auth/drizzle-adapter@1.6.7","@better-auth/core@1.6.7","@better-auth/api-key@1.6.7","v1.6.6","better-auth@1.6.6","auth@1.6.6","@better-auth/test-utils@1.6.6","@better-auth/telemetry@1.6.6","@better-auth/stripe@1.6.6","@better-auth/sso@1.6.6","@better-auth/scim@1.6.6","@better-auth/redis-storage@1.6.6","@better-auth/prisma-adapter@1.6.6","@better-auth/passkey@1.6.6","@better-auth/oauth-provider@1.6.6","@better-auth/mongo-adapter@1.6.6","@better-auth/memory-adapter@1.6.6","@better-auth/kysely-adapter@1.6.6","@better-auth/i18n@1.6.6","@better-auth/expo@1.6.6","@better-auth/electron@1.6.6","@better-auth/drizzle-adapter@1.6.6","@better-auth/core@1.6.6","@better-auth/api-key@1.6.6","v1.6.5","better-auth@1.6.5","auth@1.6.5","@better-auth/test-utils@1.6.5","@better-auth/telemetry@1.6.5","@better-auth/stripe@1.6.5","@better-auth/sso@1.6.5","@better-auth/scim@1.6.5","@better-auth/redis-storage@1.6.5","@better-auth/prisma-adapter@1.6.5","@better-auth/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