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CVE-2026-42280— Improper Permission Checking in Auth.js SDK

Quick assessment

Affected
auth0 auth0.js
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.

auth0.js是Auth0开源的一款用于Auth0 API（应用程序编程接口）的客户端JavaScript工具包。 auth0.js 8.11.0至9.32.0版本存在安全漏洞，该漏洞源于在特定条件下，Auth0.js SDK可能使用有效访问令牌错误地返回用户配置文件信息，当提供特制无效ID令牌时可能发生。

CVSS 7.1 · High EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1114.001 · Local Email Collection

Affected Version Matrix 1

VendorProduct Version RangeStatus
auth0 auth0.js >= 8.11.0 , <= 9.32.0 affected
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I. Basic Information for CVE-2026-42280

Vulnerability Information
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Vulnerability Title
Improper Permission Checking in Auth.js SDK
Source: CVE Program / CVE List V5
Vulnerability Description
Auth0.js is a client-side JavaScript library for Auth0. From 8.11.0 to 9.32.0, under specific preconditions, the Auth0.js SDK may improperly return user profile information using a valid access token when a specifically crafted invalid ID token is provided. This vulnerability is fixed in 10.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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
auth0.js 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
auth0.js是Auth0开源的一款用于Auth0 API（应用程序编程接口）的客户端JavaScript工具包。 auth0.js 8.11.0至9.32.0版本存在安全漏洞，该漏洞源于在特定条件下，Auth0.js SDK可能使用有效访问令牌错误地返回用户配置文件信息，当提供特制无效ID令牌时可能发生。
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 auth0.js >= 8.11.0 , <= 9.32.0 -

II. Public POCs for CVE-2026-42280

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8936 chars
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III. Intelligence Information for CVE-2026-42280

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Vendor Advisories for CVE-2026-42280 (1)

IV. Related Vulnerabilities

Same product: auth0.js
Same vendor: auth0
Same weakness: CWE-863

V. Comments for CVE-2026-42280

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