CVE-2026-42280: Auth0 js Auth.js SDK Has Improper Permission Vulnerability

HIGH
Advisory Identifier: GHSA-8qjv-jj2q-x832
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CVSS 7.1
CWE-863
Published
Advisory Summary

CVE-2026-42280 is a HIGH (CVSS 7.1) auth.js sdk has improper permission vulnerability (CWE-863: Incorrect Authorization) affecting Auth0 js libraries in the npm ecosystem. The issue involves auth.js sdk has improper permission checking. Remediation is available by upgrading affected packages to version 10.0.0.

CVE-2026-42280 at a Glance

CVE Identifier CVE-2026-42280
GHSA Identifier GHSA-8qjv-jj2q-x832
Severity HIGH
CVSS v3.1 Base Score 7.1
CWE Classification CWE-863: Incorrect Authorization
Affected Product Auth0 js
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-42280

To remediate this vulnerability, upgrade all affected Auth0 js dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

auth0-js fixed: 10.0.0 
npm install auth0-js@10.0.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls auth0-js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-42280, inspect your project dependencies using npm:

npm ls auth0-js

Analyze the terminal output to locate any version of Auth0 js in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 10.0.0), your application is affected.

Note: The npm ls auth0-js command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Auth0 js, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Description 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. ### Am I Affected? Users are affected if they meet each of the following preconditions: - Applications built using Auth0.js version between 8.11.0 and 9.32.0 - The application’s access control relies on rules defined in Auth0 Actions. ### Affected product and versions auth0.js SDK v8.11.0 to v9.32.0 ### Resolution Upgrade auth0/auth0.js to v10.0.0 or greater. ### Acknowledgements Okta would like to thank Quan Le (@aleister1102) for their discovery and responsible disclosure.

CVE-2026-42280 Affected Auth0 js Versions

1 component(s)
Fixed Versions:
10.0.0
Product / Package Ecosystem Affected Versions Fixed Version
auth0-js
npm/auth0-js
npm
≥ 8.11.0
< 10.0.0
10.0.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832
NVD — CVE-2026-42280 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42280
Auth0 js Source Repository REPOSITORY
https://github.com/auth0/auth0.js

Frequently Asked Questions

What is CVE-2026-42280?
CVE-2026-42280 is a security vulnerability in Auth0 js involving Auth.js SDK has Improper Permission Checking under CWE-863: Incorrect Authorization.
Which Auth0 js versions are affected?
Affected versions include releases prior to 10.0.0 across affected packages: auth0-js.
What version fixes CVE-2026-42280?
Upgrading to 10.0.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is auth0-js affected?
Yes, auth0-js is affected in releases prior to 10.0.0. Upgrade your dependency to 10.0.0 or later.
What is the CVSS score of CVE-2026-42280?
CVE-2026-42280 has a CVSS v3.1 base score of 7.1 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.
What CWE is associated with CVE-2026-42280?
CVE-2026-42280 is classified under CWE-863: Incorrect Authorization (The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.).
How can I check npm dependencies for CVE-2026-42280?
Run the dependency tree command: 'npm ls auth0-js'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-8qjv-jj2q-x832",
  "modified" : "2026-06-08T23:41:42Z",
  "published" : "2026-05-06T17:05:14Z",
  "aliases" : [ "CVE-2026-42280" ],
  "summary" : "Auth.js SDK has Improper Permission Checking",
  "details" : "### Description\nUnder 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.\n\n### Am I Affected?\nUsers are affected if they meet each of the following preconditions:\n- Applications built using Auth0.js version between 8.11.0 and 9.32.0\n- The application’s access control relies on rules defined in Auth0 Actions.\n\n\n### Affected product and versions\nauth0.js SDK v8.11.0 to v9.32.0\n\n### Resolution\nUpgrade auth0/auth0.js to v10.0.0 or greater.\n\n### Acknowledgements\nOkta would like to thank Quan Le (@aleister1102) for their discovery and responsible disclosure.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "auth0-js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "8.11.0"
      }, {
        "fixed" : "10.0.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 9.32.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-42280"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/auth0.js"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T17:05:14Z",
    "nvd_published_at" : "2026-05-27T15:16:27Z"
  }
}