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.
References
| Link | Resource |
|---|---|
| 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 |
Configurations
Configuration 1 (hide)
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History
21 Jul 2026, 15:38
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Better-auth better Auth
Better-auth Better-auth better-auth\/sso |
|
| CPE | cpe:2.3:a:better-auth:better-auth\/sso:*:*:*:*:*:node.js:*:* cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:* |
|
| References | () https://github.com/better-auth/better-auth/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00 - Patch | |
| References | () https://github.com/better-auth/better-auth/pull/9220 - Issue Tracking, Patch | |
| References | () https://github.com/better-auth/better-auth/releases/tag/v1.6.11 - Release Notes | |
| References | () https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f - Mitigation, Vendor Advisory |
15 Jul 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-15 18:16
Updated : 2026-07-21 15:38
NVD link : CVE-2026-53515
Mitre link : CVE-2026-53515
CVE.ORG link : CVE-2026-53515
JSON object : View
Products Affected
better-auth
- better_auth
- better-auth\/sso