CVE-2026-53513CWE-20CWE-345CWE-441CWE-918

Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration

Critical · published July 15, 2026

CVSS v3.1
9.6
EPSS
0%
Percentile
15.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00248 · 15.2th percentile
Weaknesses
CWE-20 · Improper Input Validation; CWE-345 · Insufficient Verification of Data Authenticity; CWE-441 · Unintended Proxy or Intermediary ('Confused Deputy'); CWE-918 · Server-Side Request Forgery (SSRF)
Published
2026-07-15T17:15Z
EPSS history
Timeline
  • 15 JUL 17:15Z
    Better Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/sso provider registration
    cvelistv5