CVE-2026-53515

Summary

Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row and does not require an owner or admin role, allowing attacker-controlled OIDC or SAML providers to drive /sso/callback/{providerId} organization provisioning. This issue is fixed in version 1.6.11.

Affected Software

VendorProductVersion RangeStatus
better-authbetter-auth>= 1.2.10, < 1.6.11affected
@better-authsso>= 1.2.10, < 1.6.11affected

Weaknesses

  • CWE-269: CWE-269: Improper Privilege Management
  • CWE-285: CWE-285: Improper Authorization
  • CWE-863: CWE-863: Incorrect Authorization

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References