CVE-2026-53515

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.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

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)

OR	cpe:2.3:a:better-auth:better-auth\/sso::::::node.js::*
	cpe:2.3:a:better-auth:better_auth::::::node.js::*

History

No history.

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

CWE

CWE-269

Improper Privilege Management

CWE-285

Improper Authorization

CWE-863

Incorrect Authorization

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