CVE-2025-71404

Medium

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.

SeverityMedium

CVSS5.1

Exploit probability—

ProductBetter-auth

PublishedAug 1, 2026

First seenAug 1, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

better-auth1.1.16 or later

Patches

github.com/better-auth/better-auth/commit/05ada0b79dbcac93cc04ceb79b23ca598d07830c

Vendor advisories

github.com/better-auth/better-auth/security/advisories/GHSA-9x4v-xfq5-m8x5

Affected products

Product	Affected versions	Fixed in
better-authnpm	0.0.2 ≤ v < 1.1.16	1.1.16

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