MEDIUM 5.1 NVD
CVE-2025-71404
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
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.
References
- https://github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c
- https://github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5
- https://www.vulncheck.com/advisories/better-auth-before-reflected-xss-via-error-parameter
This medium severity vulnerability with a CVSS score of 5.1 was published on 2026-08-01 via NVD.
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