CVE-2025-71401
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Aug 02, 2026
Vendor
unknown
Description
better-auth (npm) before 1.4.2 allows an external request to configure baseURL when it is not otherwise defined (e.g., BETTER_AUTH_URL is unset). An attacker able to make the very first request to the server after startup can poison the router's base path, causing all routes to return 404 for all users (denial of service). The issue is not reachable when baseURL is explicitly configured or on typical managed hosting platforms.