CVE WatchJul 15, 2026

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

CVSS

7.1

High

EPSS

0.2%

p15

KEV

—

Exploit Today

0-100

Published: Jul 15, 2026 · Last modified: Jul 15, 2026 · CWE-269 · CWE-285 · CWE-863

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-162026-07-18

Technical 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.

Official references

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