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

Quick assessment

Affected
better-auth passkey
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.4.0之前版本存在授权问题漏洞，该漏洞源于passkey删除端点存在不安全的直接对象引用，可能导致已认证用户通过ID删除任意passkey。

CVSS 7.1 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1556 · Modify Authentication Process

Affected Version Matrix 2

VendorProduct Version RangeStatus
better-auth passkey < 1.4.0 affected
1.4.0 unaffected
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I. Basic Information for CVE-2025-71400

Vulnerability Information
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Vulnerability Title
better-auth passkey before 1.4.0 IDOR via delete-passkey
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.4.0之前版本存在授权问题漏洞，该漏洞源于passkey删除端点存在不安全的直接对象引用，可能导致已认证用户通过ID删除任意passkey。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth passkey 0 ~ 1.4.0 -

II. Public POCs for CVE-2025-71400

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: IDOR confirmed - Alice session deleted Bob passkey (passkey-bob-1) via delete-passkey endpoint HTTP 200; Bob row gone from DB, Alice row intact
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 7152 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Full executable POC code
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POC zip download
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III. Intelligence Information for CVE-2025-71400

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Vendor Advisories for CVE-2025-71400 (2)

Same Patch Batch · better-auth · 2026-08-02 · 3 CVEs total

CVE-2025-71399 8.6 HIGH Better Auth before 1.4.5 Path Normalization Bypass via rou3
CVE-2025-71401 5.9 MEDIUM better-auth before 1.4.2 basePath Modification DoS

IV. Related Vulnerabilities

Same vendor: better-auth
Same weakness: CWE-639

V. Comments for CVE-2025-71400

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