CVE-2026-53515 (GCVE-0-2026-53515)

Vulnerability from cvelistv5 – Published: 2026-07-15 17:27 – Updated: 2026-07-15 19:30
VLAI
Title
Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso
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.
Severity
7.1 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-269 - Improper Privilege Management
  • CWE-285 - Improper Authorization
  • CWE-863 - Incorrect Authorization
Assigner
References
Impacted products
Vendor Product Version
better-auth better-auth Affected: >= 1.2.10, < 1.6.11
Create a notification for this product.
@better-auth sso Affected: >= 1.2.10, < 1.6.11
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