CVE-2025-71404: Better-Auth

Medium severity, CVSS 5.1. EPSS: 0.5% chance of exploitation in the next 30 days.

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.

Affected products

• Better-Auth Better-Auth: before 1.1.16 (fixed in 1.1.16)

Published 2026-08-01. Last modified 2026-10-06.