CVE-2026-53513
Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration
CVSS Score
9.6
EPSS Score
0.0%
EPSS Percentile
0th
Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: true is set, store them on the ssoProvider row without origin validation, and fetch them during OIDC callback, allowing non-blind server-side request forgery and possible account linking when trustEmailVerified: true is configured. This issue is fixed in version 1.6.11.
| CWE | CWE-20 CWE-345 CWE-441 CWE-918 |
| Vendor | better-auth |
| Product | better-auth |
| Published | Jul 15, 2026 |
| Last Updated | Jul 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
better-auth / better-auth
>= 0.1.0, < 1.6.11
@better-auth / sso
>= 0.1.0, < 1.6.11
References
github.com: https://github.com/better-auth/better-auth/security/advisories/GHSA-5rr4-8452-hf4v github.com: https://github.com/better-auth/better-auth/pull/9574 github.com: https://github.com/better-auth/better-auth/commit/37f60cb176cb53147da7dfd5ec15afa5b486e81e github.com: https://github.com/better-auth/better-auth/releases/tag/v1.6.11