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CVE-2026-73421— NextAuth.js: Configuration errors can cause existence-based auth checks to fail open (auth object populated with an error)

Quick assessment

Affected
nextauthjs next-auth
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.

Auth.js是Auth.js组织的一款身份验证开发框架。 Auth.js 5.0.0-beta.0至5.0.0-beta.32之前版本存在安全漏洞，该漏洞源于仅检查auth()包装器返回的auth对象存在性进行访问控制，当Auth.js服务器配置错误时，非OK会话响应被解析为真值错误对象，导致未认证请求通过身份验证检查，可能允许所有访客访问仅受会话存在性保护的路由。

CVSS 9.1 · Critical EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
nextauthjs next-auth >= 5.0.0-beta.4, < 5.0.0-beta.32 affected
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I. Basic Information for CVE-2026-73421

Vulnerability Information
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Vulnerability Title
NextAuth.js: Configuration errors can cause existence-based auth checks to fail open (auth object populated with an error)
Source: CVE Program / CVE List V5
Vulnerability Description
NextAuth.js provides authentication for Next.js. From next-auth 5.0.0-beta.0 until 5.0.0-beta.32, applications that gate access by checking only for the existence of the auth object returned by the auth() wrapper can fail open when Auth.js has a server configuration error. In middleware, Route Handlers, React Server Components, and other auth() entry points, a non-OK session response is parsed into a truthy error object instead of null, so checks such as !!auth and if (req.auth) evaluate to true for unauthenticated requests. A provider missing both the issuer and authorization endpoint triggers InvalidEndpoints, and an unset AUTH_SECRET or another server configuration error can produce the same behavior. There is no impact while configuration is valid, but after a deployment becomes misconfigured, routes protected only by session existence silently grant access to every visitor. This issue is fixed in next-auth 5.0.0-beta.32.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Auth.js 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Auth.js是Auth.js组织的一款身份验证开发框架。 Auth.js 5.0.0-beta.0至5.0.0-beta.32之前版本存在安全漏洞，该漏洞源于仅检查auth()包装器返回的auth对象存在性进行访问控制，当Auth.js服务器配置错误时，非OK会话响应被解析为真值错误对象，导致未认证请求通过身份验证检查，可能允许所有访客访问仅受会话存在性保护的路由。
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
nextauthjs next-auth >= 5.0.0-beta.4, < 5.0.0-beta.32 -

II. Public POCs for CVE-2026-73421

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10644 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
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III. Intelligence Information for CVE-2026-73421

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Patches & Fixes for CVE-2026-73421 (1)

Vendor Advisories for CVE-2026-73421 (1)

Vendor Pages for CVE-2026-73421 (1)

IV. Related Vulnerabilities

Same product: next-auth
Same vendor: nextauthjs
Same weakness: CWE-285

V. Comments for CVE-2026-73421

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