{"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":"2026-07-17T03:47:47.583778120Z","published":"2026-07-15T17:33:38.943Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53517.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-362","CWE-367"]},"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":"9d784407ca40224c9072a71ad88550f1b1353bf8"},{"fixed":"0e3f188020fa785d44d0019a3a3c8407a4cc8d5f"},{"introduced":"0e3f188020fa785d44d0019a3a3c8407a4cc8d5f"},{"fixed":"f41514ef07cfafc5dbf463bd1500aee6575d88a7"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.4.8-beta.7"},{"fixed":"1.6.0"},{"introduced":"1.6.0"},{"fixed":"1.6.11"}]}}],"versions":["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/passkey@1.6.5","@better-auth/oauth-provider@1.6.5","@better-auth/mongo-adapter@1.6.5","@better-auth/memory-adapter@1.6.5","@better-auth/kysely-adapter@1.6.5","@better-auth/i18n@1.6.5","@better-auth/expo@1.6.5","@better-auth/electron@1.6.5","@better-auth/drizzle-adapter@1.6.5","@better-auth/core@1.6.5","@better-auth/api-key@1.6.5","v1.6.4","better-auth@1.6.4","auth@1.6.4","@better-auth/test-utils@1.6.4","@better-auth/telemetry@1.6.4","@better-auth/stripe@1.6.4","@better-auth/sso@1.6.4","@better-auth/scim@1.6.4","@better-auth/redis-storage@1.6.4","@better-auth/prisma-adapter@1.6.4","@better-auth/passkey@1.6.4","@better-auth/oauth-provider@1.6.4","@better-auth/mongo-adapter@1.6.4","@better-auth/memory-adapter@1.6.4","@better-auth/kysely-adapter@1.6.4","@better-auth/i18n@1.6.4","@better-auth/expo@1.6.4","@better-auth/electron@1.6.4","@better-auth/drizzle-adapter@1.6.4","@better-auth/core@1.6.4","@better-auth/api-key@1.6.4","v1.6.3","better-auth@1.6.3","auth@1.6.3","@better-auth/test-utils@1.6.3","@better-auth/telemetry@1.6.3","@better-auth/stripe@1.6.3","@better-auth/sso@1.6.3","@better-auth/scim@1.6.3","@better-auth/redis-storage@1.6.3","@better-auth/prisma-adapter@1.6.3","@better-auth/passkey@1.6.3","@better-auth/oauth-provider@1.6.3","@better-auth/mongo-adapter@1.6.3","@better-auth/memory-adapter@1.6.3","@better-auth/kysely-adapter@1.6.3","@better-auth/i18n@1.6.3","@better-auth/expo@1.6.3","@better-auth/electron@1.6.3","@better-auth/drizzle-adapter@1.6.3","@better-auth/core@1.6.3","@better-auth/api-key@1.6.3","v1.6.2","better-auth@1.6.2","auth@1.6.2","@better-auth/test-utils@1.6.2","@better-auth/telemetry@1.6.2","@better-auth/stripe@1.6.2","@better-auth/sso@1.6.2","@better-auth/scim@1.6.2","@better-auth/redis-storage@1.6.2","@better-auth/prisma-adapter@1.6.2","@better-auth/passkey@1.6.2","@better-auth/oauth-provider@1.6.2","@better-auth/mongo-adapter@1.6.2","@better-auth/memory-adapter@1.6.2","@better-auth/kysely-adapter@1.6.2","@better-auth/i18n@1.6.2","@better-auth/expo@1.6.2","@better-auth/electron@1.6.2","@better-auth/drizzle-adapter@1.6.2","@better-auth/core@1.6.2","@better-auth/api-key@1.6.2","v1.6.1","better-auth@1.6.1","auth@1.6.1","@better-auth/test-utils@1.6.1","@better-auth/telemetry@1.6.1","@better-auth/stripe@1.6.1","@better-auth/sso@1.6.1","@better-auth/scim@1.6.1","@better-auth/redis-storage@1.6.1","@better-auth/prisma-adapter@1.6.1","@better-auth/passkey@1.6.1","@better-auth/oauth-provider@1.6.1","@better-auth/mongo-adapter@1.6.1","@better-auth/memory-adapter@1.6.1","@better-auth/kysely-adapter@1.6.1","@better-auth/i18n@1.6.1","@better-auth/expo@1.6.1","@better-auth/electron@1.6.1","@better-auth/drizzle-adapter@1.6.1","@better-auth/core@1.6.1","@better-auth/api-key@1.6.1","v1.6.0","better-auth@1.6.0","auth@1.6.0","@better-auth/test-utils@1.6.0","@better-auth/telemetry@1.6.0","@better-auth/stripe@1.6.0","@better-auth/sso@1.6.0","@better-auth/scim@1.6.0","@better-auth/redis-storage@1.6.0","@better-auth/prisma-adapter@1.6.0","@better-auth/passkey@1.6.0","@better-auth/oauth-provider@1.6.0","@better-auth/mongo-adapter@1.6.0","@better-auth/memory-adapter@1.6.0","@better-auth/kysely-adapter@1.6.0","@better-auth/i18n@1.6.0","@better-auth/expo@1.6.0","@better-auth/electron@1.6.0","@better-auth/drizzle-adapter@1.6.0","@better-auth/core@1.6.0","@better-auth/api-key@1.6.0","v1.5.7-beta.1","v1.5.1-beta.4","v1.5.1-beta.3","v1.5.1-beta.2","v1.5.1-beta.1","v1.5.0-beta.20","v1.5.0-beta.19","v1.5.0-beta.18","v1.5.0-beta.17","v1.5.0-beta.16","v1.5.0-beta.15","v1.5.0-beta.14","v1.5.0-beta.13","v1.5.0-beta.12","v1.5.0-beta.11","v1.5.0-beta.10","v1.5.0-beta.9","v1.5.0-beta.8","v1.5.0-beta.7","v1.5.0-beta.6","v1.5.0-beta.5","v1.5.0-beta.4","v1.5.0-beta.3","v1.5.0-beta.2","v1.5.0-beta.1","v1.4.8-beta.7"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53517.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}