What is CVE-2026-42280?

CVE-2026-42280 is a high-severity vulnerability in Auth0 Auth0.js, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-05-27.

How severe is CVE-2026-42280?

High severity. CVSS v3 base score is 7.1 out of 10.

Auth bypass in Auth0 Auth0.js

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…

Vulnerability class: Broken Access Control

EPSS: 0.000 (9.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N.

Affected products

Auth0 Auth0.js — versions >= 8.11.0 , <= 9.32.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2026-42280?: CVE-2026-42280 is a high-severity vulnerability in Auth0 Auth0.js, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-05-27.
How severe is CVE-2026-42280?: High severity. CVSS v3 base score is 7.1 out of 10.