High severity8.1NVD Advisory· Published Jul 15, 2026· Updated Jul 21, 2026
CVE-2026-53517
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
@better-auth/oauth-providernpm | >= 1.6.0, < 1.6.11 | 1.6.11 |
better-authnpm | >= 1.4.8-beta.7, < 1.6.0 | 1.6.0 |
Affected products
5cpe:2.3:a:better-auth:better-auth\/oauth-provider:*:*:*:*:*:node.js:*:*+ 4 more
- cpe:2.3:a:better-auth:better-auth\/oauth-provider:*:*:*:*:*:node.js:*:*range: >=1.6.0,<1.6.11
- cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*range: >=1.4.9,<1.6.11
- cpe:2.3:a:better-auth:better_auth:1.4.8:-:*:*:*:node.js:*:*
- cpe:2.3:a:better-auth:better_auth:1.4.8:beta7:*:*:*:node.js:*:*
- (no CPE)range: 1.4.8-beta.7 to 1.6.11, and embedded versions before 1.6.0
Patches
Vulnerability mechanics
References
6- github.com/better-auth/better-auth/commit/c6918ecc9e3a75892169415d7f6c95b591b6a52dnvdPatchWEB
- github.com/advisories/GHSA-392p-2q2v-4372ghsaADVISORY
- github.com/better-auth/better-auth/security/advisories/GHSA-392p-2q2v-4372nvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-53517ghsaADVISORY
- github.com/better-auth/better-auth/releases/tag/v1.6.0ghsaWEB
- github.com/better-auth/better-auth/releases/tag/v1.6.11nvdRelease NotesWEB
News mentions
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