CVE-2026-53517
better-auth better-auth, oauth-provider, better-auth/oauth-provider 취약점
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.
- 대응 우선순위
- 점검
- CVSS
- 8.1
- EPSS
- 0.24% 백분위 15.3% · 2026.07.29 기준
- CISA KEV
- 미등록
- 조치 기한
- -
- 공개일
- 2026.07.16