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

> CVE-2026-42280: Improper Permission Checking in Auth.js SDK. CVSS 7.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-42280
Last updated: 2026-06-17T10:47:37Z

- Published: 2026-05-27 14:39 UTC · Updated: 2026-06-17 10:47 UTC · Assigner: GitHub\_M
- CVSS: 7.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
- EPSS: 0.21%, 11th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## 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.

## Affected vendors and products

- auth0: auth0.js

## Tracked companies

- [Auth0](https://rewindex.com/company/auth0.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-42280)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-42280)
- [https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832](https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-42280 · Markdown: https://rewindex.com/cve/CVE-2026-42280.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-42280 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:43.344Z