Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-48309— next-auth vulnerable to possible user mocking that bypasses basic authentication

Quick assessment

Affected
nextauthjs next-auth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

next-auth是Next.js应用程序的完整开源身份验证解决方案。 next-auth 4.24.5 之前版本存在安全漏洞，该漏洞源于攻击者可以通过从中断的 OAuth 登录流程（状态、PKCE 或随机数）来获取 NextAuth.js 颁发的 JWT，并创建模拟用户，攻击者利用该漏洞可以窥视登录的用户状态。

CVSS 5.3 · Medium EPSS 0.70% · P52

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-48309

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
next-auth vulnerable to possible user mocking that bypasses basic authentication
Source: CVE Program / CVE List V5
Vulnerability Description
NextAuth.js provides authentication for Next.js. `next-auth` applications prior to version 4.24.5 that rely on the default Middleware authorization are affected by a vulnerability. A bad actor could create an empty/mock user, by getting hold of a NextAuth.js-issued JWT from an interrupted OAuth sign-in flow (state, PKCE or nonce). Manually overriding the `next-auth.session-token` cookie value with this non-related JWT would let the user simulate a logged in user, albeit having no user information associated with it. (The only property on this user is an opaque randomly generated string). This vulnerability does not give access to other users' data, neither to resources that require proper authorization via scopes or other means. The created mock user has no information associated with it (ie. no name, email, access_token, etc.) This vulnerability can be exploited by bad actors to peek at logged in user states (e.g. dashboard layout). `next-auth` `v4.24.5` contains a patch for the vulnerability. As a workaround, using a custom authorization callback for Middleware, developers can manually do a basic authentication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
next-auth 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
next-auth是Next.js应用程序的完整开源身份验证解决方案。 next-auth 4.24.5 之前版本存在安全漏洞，该漏洞源于攻击者可以通过从中断的 OAuth 登录流程（状态、PKCE 或随机数）来获取 NextAuth.js 颁发的 JWT，并创建模拟用户，攻击者利用该漏洞可以窥视登录的用户状态。
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 < 4.24.5 -

II. Public POCs for CVE-2023-48309

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2023-48309

请登录查看更多情报信息。

Vendor Advisories for CVE-2023-48309 (1)

Other References for CVE-2023-48309 (3)

IV. Related Vulnerabilities

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

V. Comments for CVE-2023-48309

No comments yet

Leave a comment