CVEvulnerability

CVE-2026-53517

8.1 HIGH Published 2026-07-15 Modified 2026-07-21 Official page ↗
Status
Analyzed
Published
2026-07-15
Last modified
2026-07-21
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-362, CWE-367

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 configurations

• better-auth better-auth\/oauth-provider (>= 1.6.0 < 1.6.11) • better-auth better auth (>= 1.4.9 < 1.6.11) • better-auth better auth 1.4.8

Related

Weakness · CWE (2)

  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References