Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| better-auth | better-auth | >= 1.4.8-beta.7, < 1.6.0 | — |
| @better-auth | oauth-provider | >= 1.6.0, < 1.6.11 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| npm | @better-auth/oauth-provider | >= 1.6.0, < 1.6.11 | 1.6.11 | GHSA-392p-2q2v-4372 |
| npm | better-auth | >= 1.4.8-beta.7, < 1.6.0 | 1.6.0 | GHSA-392p-2q2v-4372 |