CVE-2025-71400

High

Description

better-auth passkey versions before 1.4.0 contain an insecure direct object reference vulnerability in the passkey deletion endpoint that allows authenticated users to delete arbitrary passkeys by ID. Attackers with valid sessions can submit crafted requests to the delete-passkey endpoint with enumerated passkey IDs to remove other users' passkeys.

SeverityHigh

CVSS7.1

Exploit probability—

Product@better-auth/passkey

PublishedAug 2, 2026

First seenAug 2, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

@better-auth/passkey1.4.0 or later

Vendor advisories

github.com/better-auth/better-auth/security/advisories/GHSA-4vcf-q4xf-f48m

Affected products

Product	Affected versions	Fixed in
@better-auth/passkeynpm	v < 1.4.0	1.4.0

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