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CVE-2026-53515

CVE-2026-53515 · Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.1 · High · EPSS 0.4% · Fix available

Published
Updated

Stack: node

Affected products and versions

  • better-auth

    Versions
    • >= 1.2.10, < 1.6.11: Affected

    No fix published

  • sso

    Versions
    • >= 1.2.10, < 1.6.11: Affected

    No fix published

  • @better-auth/sso npm

    Affected ranges
    • SEMVER: ≥ 1.2.10, < 1.6.11

    Update to 1.6.11

Original sources

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