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.
References
| Link | Resource |
|---|---|
| https://github.com/better-auth/better-auth/commit/b4bc65a007784b2eb0efb459e5fa6fd8055d3ec9 | Patch |
| https://github.com/better-auth/better-auth/releases/tag/v1.6.11 | Release Notes |
| https://github.com/better-auth/better-auth/security/advisories/GHSA-7w99-5wm4-3g79 | Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
21 Jul 2026, 16:03
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Better-auth better Auth
Better-auth better-auth\/oauth-provider Better-auth |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 8.1 |
| CPE | cpe:2.3:a:better-auth:better-auth\/oauth-provider:*:*:*:*:*:node.js:*:* cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:* |
|
| References | () https://github.com/better-auth/better-auth/commit/b4bc65a007784b2eb0efb459e5fa6fd8055d3ec9 - Patch | |
| References | () https://github.com/better-auth/better-auth/releases/tag/v1.6.11 - Release Notes | |
| References | () https://github.com/better-auth/better-auth/security/advisories/GHSA-7w99-5wm4-3g79 - Mitigation, Vendor Advisory |
15 Jul 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-15 18:16
Updated : 2026-07-21 16:03
NVD link : CVE-2026-53518
Mitre link : CVE-2026-53518
CVE.ORG link : CVE-2026-53518
JSON object : View
Products Affected
better-auth
- better_auth
- better-auth\/oauth-provider