VULNERABILITY INTELLIGENCE
CVE-2025-71401
CVSS score9.3 CRITICAL
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-08-02
Last modified2026-10-06
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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.
Weakness classification
- CWE-770: Allocation of Resources Without Limits or Throttling