CVE-2026-53515: Improper Privilege Management

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 a...

@better-auth/sso provider registration has server-side request forgery via unvalidated OIDC endpoints

Am I affected? Users are affected if all of the following are true: - Their application uses @better-auth/sso at a version = 0.1.0, 1.6.11 on the stable line, or any 1.7.0-beta.x on the pre-release line. - The sso plugin is added to their application's betterAuth plugins: ... array. - Any user wi...

PT-2026-56298

Name of the Vulnerable Software and Affected Versions @better-auth/sso versions 0.1.0 through 1.6.10 @better-auth/sso versions 1.7.0-beta.x Description An SSRF flaw exists in the provider registration flow where OpenID Connect OIDC endpoint URLs are accepted without proper validation. When...