CVE-2025-71400: better-auth passkey before 1.4.0 IDOR via delete-passkey

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-02 · updated 2026-10-08
Weakness: CWE-639

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.

Affected products

better-auth passkey: before 1.4.0 — fixed in 1.4.0

How to fix

Upgrade to a fixed version: better-auth passkey 1.4.0. Check the vendor advisory for mitigations.

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-4vcf-q4xf-f48m
https://www.vulncheck.com/advisories/better-auth-passkey-before-idor-via-delete-passkey

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