Improper Permission Checking in Auth.js SDK

published 2026-05-06 6mo ago modified 2026-10-26 14d ago also EUVD-2026-32533 , GHSA-8qjv-jj2q-x832

cvss: 7.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 11%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

npm auth0-js 10.0.0
auth0 auth0.js 10.0.0

Is CVE-2026-42280 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5mo ago (2026-05-28)

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
GitHub	3.1	7.1	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	auth0-js	>=8.11.0, <10.0.0	10.0.0

Affected products

auth0 auth0.js

Classification

Weakness

CWE-863 Incorrect Authorization

References

github.com /auth0/auth0.js/security/advisories/GHSA-8qjv-jj2q-x832
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-42280
advisory
github.com /auth0/auth0.js
package

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

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