CVE-2026-42280

Name: CVE-2026-42280
Creator: NVD / NIST
Published: 2026-05-27T15:16:27.753+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.21%

Last modified Jun 17, 2026

CVE-2026-42280 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.21%

11.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-863

Affected Software

Vendor	Product	Versions
Auth0	Auth0.Js	>= 8.11.0, < 10.0.0

References

https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832Vendor Advisory

Timeline

Published: May 27, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42280?

How severe is CVE-2026-42280?

CVE-2026-42280 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42280?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42280?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST