Vulnerability Report

CVE-2026-42280

Title: Auth0.js ID Token Validation Bypass

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-42280.

CWE Category CWE-863

Published Date May 27, 2026

Modified Date Jun 04, 2026

Exploit Status Not Found

Score 7.1 CVSS v3.1

Exploit Probability (EPSS)

0.21%

Vulnerability Summary

CVE-2026-42280: 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.

Impacted Vendors

auth0 1

Reference Links

https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42280 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 04, 2026 MODIFIED

Vulnerability data updated via NVD.

May 29, 2026 MODIFIED

Vulnerability data updated via NVD.

May 27, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected Stack

No specific products linked.