CVE-2026-53515

Description

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.

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Produits concernés

• better-auth
• @better-auth sso
• Better-auth better-auth\/sso
• Better-auth better auth

Scores CVSS

Faiblesses (CWE)

• CWE-269
• CWE-285
• CWE-863

Références

• https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00 Patch
• https://github.com/better-auth/better-auth/pull/9220 Issue TrackingPatch
• https://github.com/better-auth/better-auth/releases/tag/v1.6.11 Release Notes
• https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f MitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories