CVE-2026-53513

Severity CVSS v4.0:

Pending analysis

Type:

CWE-20 Input Validation

Publication date:

15/07/2026

Last modified:

21/07/2026

Description

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin&#39;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.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N CVSS v3.1 Severity and Metrics:

Base Score: 9.60 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): None

Base Score 3.x

9.60

Severity 3.x

CRITICAL

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:a:better-auth:better-auth\/sso::::::node.js::*		1.6.11 (excluding)
cpe:2.3:a:better-auth:better_auth::::::node.js::*	0.1.0 (including)	1.6.11 (excluding)

To consult the complete list of CPE names with products and versions, see this page

CVE-2026-53513

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools