Vulnerability · Published Aug 2, 2026 · Assigned by VulnCheck

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

High 7.1

In plain English

A high-severity authorization bypass via user-controlled key in passkey from better-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.4%top 71.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@better-auth/passkey	1.4.0	GHSA-4vcf-q4xf-f48m

Affected products (as reported)

Vendor	Product	Versions
better-auth	passkey	0 – before 1.4.0

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

References

GitHub Security Advisory (GHSA-4vcf-q4xf-f48m) vendor-advisory
VulnCheck Advisory: better-auth passkey before 1.4.0 IDOR via delete-passkey third-party-advisory