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CVE-2026-42280

Improper Permission Checking in Auth.js SDK

HIGH
7.1
CVSS Score
Published: May 27, 2026 at 02:39 PM UTC
Updated: October 26, 2026 at 11:10 AM UTC
1 product affected across 1 vendorAuth0.js

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Severity
HIGH7.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Auth0.js· AUTH0npm
95%
8.11.0 ≤ v < 10.0.0
Affected range stops below 10.0.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://github.com/auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-863

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