CVE-2026-53515

HIGH

Better Auth: Privilege escalation via SSO provider registration: missing admin role check in @better-auth/sso

Title source: cna
STIX 2.1

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.

Scores

CVSS v3 7.1
EPSS 0.0024
EPSS Percentile 15.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-269 CWE-285 CWE-863
Status published
Products (5)
@better-auth/sso >= 1.2.10, < 1.6.11
better-auth/better-auth >= 1.2.10, < 1.6.11
better-auth/better-auth\/sso < 1.6.11
better-auth/better_auth 1.2.10 - 1.6.11
better-auth/sso 1.2.10 - 1.6.11npm
Published Jul 15, 2026
Tracked Since Jul 15, 2026