HIGH🇵🇱 Wersja polska

CVE-2026-53517

CVSS 8.1v3.1pub. 2026-07-15upd. 2026-07-21

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.

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

  • Better Auth

    APP
    Better-Auth
    1.4.81.4.9 – 1.6.11 (excl.)

  • Better Auth Better Auth\/oauth Provider

    APP
    Better-Auth
    1.6.0 – 1.6.11 (excl.)
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CHECK WITH VENDOR
No clear patch data available. Check vendor references.
CWE
References

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