5.1Medium
CVE-2025-71404better-auth before 1.1.16 Reflected XSS via error parameter
Description
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.
Weakness (CWE):
CWE-79
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| better-auth | better-auth | < 1.1.16, fixed 1.1.16 | |
| better-auth | better-auth/oauth-provider | < 1.1.16 |
References and patches
- GitHub Security Advisory (GHSA-9x4v-xfq5-m8x5) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: better-auth before 1.1.16 Reflected XSS via error parameter third-party-advisory