CVEvulnerability
CVE-2026-53515
7.1 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-15
- Last modified
- 2026-07-21
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.1 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
- Weaknesses
- CWE-269, CWE-285, CWE-863
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.
Affected configurations
• better-auth better-auth\/sso (< 1.6.11)
• better-auth better auth (>= 1.2.10 < 1.6.11)
Related
References
- https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00 Patch
- https://github.com/better-auth/better-auth/pull/9220 Issue Tracking, Patch
- 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 Mitigation, Vendor Advisory