high7.1
CVE-2026-53515
@better-auth/sso: SSO provider may allow registration for any org member without a checking their role
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @better-auth/sso | >= 1.2.10, < 1.6.11 | 1.6.11 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Better-Auth | Better-Auth\/Sso | before 1.6.11 |
| Better-Auth | Better Auth | from 1.2.10 before 1.6.11 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-gv74-j8m3-fg5f
- https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f
- https://nvd.nist.gov/vuln/detail/CVE-2026-53515
- https://github.com/better-auth/better-auth/issues/9133
- https://github.com/better-auth/better-auth/pull/9220
- https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11