Riskcovery

CVE-2026-53513

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

State
Published
Severity
9.6 Critical
Published
Jul 15, 2026
Updated
Jul 15, 2026
Reserved
Jun 9, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.19.6 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:NGitHub_M

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)

Affected Products

ProductVersions
better-authbetter-auth
  • >= 0.1.0, < 1.6.11Affected
sso@better-auth
  • >= 0.1.0, < 1.6.11Affected

References

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