Fiche vulnérabilité
CVE-2026-53518 : faille élevée better-auth better-auth\/oauth-provider (CVSS 8.1)
Description
Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.
En bref
- Sévérité
- Élevée (CVSS 8.1)
- Vecteur CVSS
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
- Exploitation active
- Non signalée par la CISA
- Publication
- 15 juil. 2026
- Dernière mise à jour
- 21 juil. 2026
Produits concernés
- better-auth better-auth\/oauth-provider
- better-auth better auth