Critical severity9.1NVD Advisory· Published Jul 15, 2026· Updated Jul 21, 2026
CVE-2026-53512
CVE-2026-53512
Description
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
better-authnpm | < 1.6.11 | 1.6.11 |
Affected products
2cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:*range: <1.6.11
- (no CPE)range: <1.6.11
Patches
Vulnerability mechanics
References
6- github.com/better-auth/better-auth/commit/1f2ff4215c4affff0b140b0c0a712c0dde35659cnvdPatchWEB
- github.com/better-auth/better-auth/pull/9576nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-pw9m-5jxm-xr6hghsaADVISORY
- github.com/better-auth/better-auth/security/advisories/GHSA-pw9m-5jxm-xr6hnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-53512ghsaADVISORY
- github.com/better-auth/better-auth/releases/tag/v1.6.11nvdRelease NotesWEB
News mentions
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