CVE-2025-71400

better-auth passkey before 1.4.0 IDOR via delete-passkey

Published Aug 2, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

The vulnerability is an insecure direct object reference in the passkey deletion endpoint. An authenticated user can submit a delete request with any passkey ID, causing the target passkey to be removed without ownership verification. This defeat of the ownership check removes the target user’s credential store, potentially eliminating their access and compromising the integrity of user data.

Affected Systems

The flaw exists in the better-auth:passkey service in all productions releases before version 1.4.0. Any deployment running those earlier releases is vulnerable.

Risk and Exploitability

The CVSS score of 7.1 reflects moderate‑to‑high risk; the EPSS score is currently unavailable, but the lack of public exploits does not preclude an attacker with a valid session from performing the deletion. The attack vector is remote through crafted HTTP requests to the delete‑passkey endpoint, and the vulnerability is listed as not in the CISA KEV catalog. An attacker only needs an authenticated session; no special privilege or additional privileges are required beyond the user’s own access rights.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

better-auth

passkey

unaffected

Version	Status	Constraints
`0`	affected	< 1.4.0
`1.4.0`	unaffected	—

No data.

Vendor Product Versions

Better-auth

Better-auth/oauth-provider

Version	Status	Scheme	Platform
`[0,*]`	affected	generic	['node.js']

Better-auth

Passkey

Version	Status	Scheme	Platform
`[0,1.4.0)`	affected	semver	—
`1.4.0`	unaffected	semver	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade the better-auth:passkey service to version 1.4.0 or newer which removes the IDOR.
Ensure that the delete-passkey endpoint verifies that the requesting user is the owner of the passkey before performing the deletion.
Audit existing passkey records to confirm no unauthorized deletions have occurred since the vulnerability was present.

Generated by OpenCVE AI on August 3, 2026 at 09:17 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.352% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
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

History

Aug 3, 2026 4:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Aug 2, 2026 9:00 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Better-auth better-auth/oauth-provider Better-auth passkey
Vendors & Products		Better-auth better-auth/oauth-provider Better-auth passkey

Aug 2, 2026 12:45 PM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		better-auth passkey before 1.4.0 IDOR via delete-passkey
First Time appeared		Better-auth Better-auth better-auth\/oauth-provider
Weaknesses		CWE-639
CPEs		cpe:2.3:a:better-auth:better-auth\/oauth-provider::::::node.js::*
Vendors & Products		Better-auth Better-auth better-auth\/oauth-provider
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
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'}` cvssV4_0 `{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}`