CVE-2026-53515
HIGH
7.1
CVSS 3.1
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.
Metadata
Severity & Metrics
7.1
HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
SSVC — CISA Coordinator
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| @better-auth | sso | — | >= 1.2.10, < 1.6.11 |
| better-auth | better-auth | — | >= 1.2.10, < 1.6.11 |
Weakness (CWE)
CVSS scores (1)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 7.1 | HIGH | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N |
References (4)
- https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f https://github.com/better-auth/better-auth/security/advisories/GHSA-gv74-j8m3-fg5f
- https://github.com/better-auth/better-auth/pull/9220 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/commit/86765f1597378f5c3deed1b80ca91faac0a6bf00
- https://github.com/better-auth/better-auth/releases/tag/v1.6.11 https://github.com/better-auth/better-auth/releases/tag/v1.6.11