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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History
Wed, 15 Jul 2026 20:30:00 +0000
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ssvc
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Wed, 15 Jul 2026 18:00:00 +0000
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| 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. | |
| Title | Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso | |
| Weaknesses | CWE-269 CWE-285 CWE-863 |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-07-15T19:30:08.165Z
Reserved: 2026-06-09T17:30:33.456Z
Link: CVE-2026-53515
Updated: 2026-07-15T19:29:59.967Z
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