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HIGH severity

CVE-2026-42280 — auth0-js

HIGH

CVE-2026-42280 is a high-severity (CVSS 7.1) CWE-863 vulnerability in auth0-js. A fix is available for auth0-js — see the affected versions and patch details below.

Improper Permission Checking in Auth.js SDK

Also known asGHSA-8qjv-jj2q-x832
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-42280.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk-0.08%
Lower risk than most CVEs11th percentile — riskier than 11% of all scored CVEsHighest risk
0.00%0.26%0.53%0.79%0.0%0.2%Jun 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

416other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
auth0-jsnpm
371Kdownloads / week

Description

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmauth0-js≥ 8.11.0&&< 10.0.010.0.0npm install auth0-js@10.0.0

Affected Products

1 product · 1 configurations
Application
auth0.jsauth0
≥ 8.11.0 && < 10.0.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for auth0-js, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update auth0-js to 10.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-42280 is resolved across your whole dependency graph.

  3. Workarounds

    Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

Frequently Asked Questions

### 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 t
O3 Security · Impact-Aware SCA

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CVE-2026-42280: auth0-js — Fixed in 10.0.0