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CVE-2026-42280

Improper Permission Checking in Auth.js SDK

Published: May 27, 2026Updated: May 27, 2026 Sources: CVE List NVD

7.1CVSS

HIGH

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.

EPSS Score

N/A

CISA KEV

Not in KEV

Exploits

No Known Exploits

Remediation

No Fix Available

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:LIntegrity

Low

A:NAvailability

None

Weaknesses

CWE-863

Affected Products

auth0.js

auth0

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques

Initial Access

View detailed technique mapping

References

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

github.com

Timeline

Published

May 27, 2026

Last Updated

May 27, 2026

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