CVE-2026-40155— Auth0 Next.js SDK has Improper Proxy Cache Lookup
Quick assessment
Affected
auth0 nextjs-auth0
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.
nextjs-auth0是Auth0开源的一个Next.js SDK，用于使用Auth0登录。 nextjs-auth0 4.12.0至4.17.1版本存在安全漏洞，该漏洞源于同时触发随机数重试的请求可能导致代理缓存获取器对令牌请求结果执行不当查找。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-40155
Vulnerability Information
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Vulnerability Title
Auth0 Next.js SDK has Improper Proxy Cache Lookup
Source: CVE Program / CVE List V5
Vulnerability Description
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. In versions 4.12.0 through 4.17.1, simultaneous requests that trigger a nonce retry may cause the proxy cache fetcher to perform improper lookups for the token request results. Users are affected if their project uses both the vulnerable versions and the proxy handler /me/* and /my-org/* with DPoP enabled. This issue has been fixed in version 4.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
nextjs-auth0 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nextjs-auth0是Auth0开源的一个Next.js SDK，用于使用Auth0登录。 nextjs-auth0 4.12.0至4.17.1版本存在安全漏洞，该漏洞源于同时触发随机数重试的请求可能导致代理缓存获取器对令牌请求结果执行不当查找。
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 |
|---|---|---|---|---|
| auth0 | nextjs-auth0 | >= 4.12.0, < 4.18.0 | - |
|
II. Public POCs for CVE-2026-40155
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-40155 (1)
IV. Related Vulnerabilities
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CVE-2025-67716
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Stored Cross-Site Scripting (XSS) in Auth0 AD/LDAP Connector -
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V. Comments for CVE-2026-40155
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