CVE-2026-53517

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.

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Produits concernés

• better-auth
• @better-auth oauth-provider
• Better-auth better-auth\/oauth-provider
• Better-auth better auth

Scores CVSS

Faiblesses (CWE)

• CWE-362
• CWE-367

Références

• https://github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52d Patch
• https://github.com/better-auth/better-auth/releases/tag/v1.6.11 Release Notes
• https://github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372 MitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories