How severe is CVE-2026-42280?

CVE-2026-42280 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-42280 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42280?

CVE-2026-42280 affects Auth0 Auth0.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42280?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-42280 have an EU (EUVD) identifier?

Yes. CVE-2026-42280 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32533.

When was CVE-2026-42280 published?

CVE-2026-42280 was published on 2026-05-27 and last updated on 2026-06-17.

CVE-2026-42280

CVE-2026-42280 is a high-severity vulnerability in Auth0 Auth0.js with a CVSS 3.x base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 7.1)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-32533
Weakness: CWE-863
Affected product: Auth0 Auth0.js
Published: 2026-05-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 token is provided. This vulnerability is fixed in 10.0.0.
How severe is CVE-2026-42280?: CVE-2026-42280 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-42280 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42280?: CVE-2026-42280 affects Auth0 Auth0.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42280?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-42280 have an EU (EUVD) identifier?: Yes. CVE-2026-42280 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-32533.
When was CVE-2026-42280 published?: CVE-2026-42280 was published on 2026-05-27 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:auth0:auth0.js:*:*:*:*:*:node.js:*:*

More vulnerabilities in Auth0 Auth0.js

CVE-2018-6873 — Critical (CVSS 9.8): The Auth0 authentication service before 2017-10-15 allows privilege escalation because the JWT audience is not…
CVE-2018-6874 — High (CVSS 8.8): CSRF exists in the Auth0 authentication service through 14591 if the Legacy Lock API flag is enabled.
CVE-2018-7307 — High (CVSS 8.8): The Auth0 Auth0.js library before 9.3 has CSRF because it mishandles the case where the authorization response lacks…
CVE-2020-15125 — High (CVSS 7.7): In auth0 (npm package) versions before 2.27.1, a DenyList of specific keys that should be sanitized from the request…
CVE-2017-17068 — High (CVSS 7.5): A cross-origin vulnerability has been discovered in the Auth0 auth0.js library affecting versions < 8.12. This…
CVE-2020-5263 — Medium (CVSS 5.5): auth0.js (NPM package auth0-js) greater than version 8.0.0 and before version 9.12.3 has a vulnerability. In the case…

All CVEs affecting Auth0 Auth0.js →

Other CWE-863 (Incorrect Authorization) vulnerabilities

CVE-2026-69555 — Critical (CVSS 10.0): Incorrect authorization in Azure Arc allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-71398 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Incorrect Authorization vulnerability that could result in arbitrary…
CVE-2026-27302 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Incorrect Authorization vulnerability that could result in arbitrary…
CVE-2026-48449 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Incorrect Authorization vulnerability that could result in arbitrary…
CVE-2026-48286 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9396 and earlier are affected by an Incorrect Authorization…
CVE-2026-48303 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) versions 7.4.3 build 9394 and earlier are affected by an Incorrect Authorization…

Browse all CWE-863 (Incorrect Authorization) vulnerabilities →