CVE-2021-43812— Open redirect in nextjs-auth0
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.
Auth0是是一个身份验证代理，支持社会和企业身份提供者，包括Active Directory、LDAP、谷歌Apps和Salesforce。 Auth0 Next.js SDK 1.6.2之前版本存在输入验证错误漏洞，该漏洞源于程序不会从登录url中过滤掉某些returnTo参数值，这将使应用程序暴露在开放重定向漏洞中。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-43812
Vulnerability Information
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Vulnerability Title
Open redirect in nextjs-auth0
Source: CVE Program / CVE List V5
Vulnerability Description
The Auth0 Next.js SDK is a library for implementing user authentication in Next.js applications. Versions before 1.6.2 do not filter out certain returnTo parameter values from the login url, which expose the application to an open redirect vulnerability. Users are advised to upgrade as soon as possible. There are no known workarounds for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Auth0 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Auth0是是一个身份验证代理，支持社会和企业身份提供者，包括Active Directory、LDAP、谷歌Apps和Salesforce。 Auth0 Next.js SDK 1.6.2之前版本存在输入验证错误漏洞，该漏洞源于程序不会从登录url中过滤掉某些returnTo参数值，这将使应用程序暴露在开放重定向漏洞中。
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 | < 1.6.2 | - |
|
II. Public POCs for CVE-2021-43812
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2021-43812 (1)
Vendor Advisories for CVE-2021-43812 (1)
-
https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvp x_refsource_CONFIRM
IV. Related Vulnerabilities
Same product: nextjs-auth0
-
CVE-2026-40155
Auth0 Next.js SDK has Improper Proxy Cache Lookup -
CVE-2025-67716
Auth0 Next.js SDK has Improper Validation of Query Parameter -
CVE-2025-67490
Auth0 Next.js SDK has Improper Request Caching Lookup -
CVE-2025-48947
NextJS-Auth0 SDK Vulnerable to CDN Caching of Session Cookie -
CVE-2025-46344
Auth0 NextJS SDK v4 Missing Session Invalidation
Same vendor: auth0
-
CVE-2026-42280
Improper Permission Checking in Auth.js SDK -
CVE-2026-40155
Auth0 Next.js SDK has Improper Proxy Cache Lookup -
CVE-2026-34236
Auth0 PHP SDK Insufficient Entropy in Cookie Encryption -
CVE-2025-68129
Auth0-PHP SDK has Improper Audience Validation -
CVE-2025-67716
Auth0 Next.js SDK has Improper Validation of Query Parameter
Same weakness: CWE-601
-
CVE-2026-80200
Kimai before 2.53.0 Open Redirect via RelayState -
CVE-2026-79786
Coroot 1.20.2 through 1.24.5 Unvalidated Redirect URI in MCP -
CVE-2026-79662
Ech0 before 4.7.3 OAuth Redirect URI Validation Bypass -
CVE-2026-78145
CTFd __init__.py _is_safe_url redirect -
CVE-2026-55185
Miniflux 2: Open Redirect Bypass
V. Comments for CVE-2021-43812
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