Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the legacy oidcProvider and mcp plugins expose OAuth token endpoints whose refresh_token grant authenticates only possession of the bound refreshToken row and matching client_id, without verifying the confidential client's client_secret, allowing an attacker with a valid refresh_token to mint access tokens and rotated refresh tokens through /api/auth/oauth2/token or /api/auth/mcp/token. The @better-auth/oauth-provider package is not affected. This issue is fixed in version 1.6.11.
References
| Link | Resource |
|---|---|
| https://github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659c | Patch |
| https://github.com/better-auth/better-auth/pull/9576 | Issue Tracking 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-pw9m-5jxm-xr6h | Mitigation Vendor Advisory |
Configurations
History
21 Jul 2026, 13:33
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659c - Patch | |
| References | () https://github.com/better-auth/better-auth/pull/9576 - Issue Tracking, 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-pw9m-5jxm-xr6h - Mitigation, Vendor Advisory | |
| First Time |
Better-auth better Auth
Better-auth |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.1 |
| CPE | cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:* |
15 Jul 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-15 18:16
Updated : 2026-07-21 13:33
NVD link : CVE-2026-53512
Mitre link : CVE-2026-53512
CVE.ORG link : CVE-2026-53512
JSON object : View
Products Affected
better-auth
- better_auth