Vulnerability in @Better-auth Oauth-provider
CVE-2026-53517
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…
Vulnerability class: Race Condition
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
Affected products
- @Better-auth Oauth-provider — versions >= 1.6.0, < 1.6.11
- Better-auth — versions >= 1.4.8-beta.7, < 1.6.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-53517?
- CVE-2026-53517 is a high-severity vulnerability in @Better-auth Oauth-provider, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 8.1/10. Published 2026-07-15.
- How severe is CVE-2026-53517?
- High severity. CVSS v3 base score is 8.1 out of 10.