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CVE-2026-53515

Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
better-auth / better-authaffected >= 1.2.10, < 1.6.11
@better-auth / ssoaffected >= 1.2.10, < 1.6.11

CWE

CWE-269, CWE-285, CWE-863

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.