CVE-2026-42280: Auth0.js is a client-side JavaScript library for Auth0

Q: How do I fix CVE-2026-42280?

auth0.js: upgrade to 10.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-42280 being exploited?

CVE-2026-42280 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-42280 affect?

CVE-2026-42280 affects auth0.js. Severity is high (CVSS 7.1). 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 t

Routine

HIGH 7.1UPGRADE

CVE-2026-42280 is a high-severity flaw (CVSS 7.1) affecting auth0.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.1 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 89%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-05-27
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: auth0

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-27 15:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

auth0 auth0.js UPGRADE

Affected: >= 8.11.0 and < 10.0.0

Fixed in: 10.0.0

Safe to downgrade to: a release before 8.11.0

1. Check installed version

npm ls auth0.js

2. UPGRADE to 10.0.0

npm install auth0.js@">=10.0.0"

3. If no update is available yet, DOWNGRADE to a release before 8.11.0

npm view auth0.js versions npm install auth0.js@"<8.11.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42280?

auth0.js: upgrade to 10.0.0. Exact commands for each OS are on this page.

Is CVE-2026-42280 being exploited?

CVE-2026-42280 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42280 affect?

CVE-2026-42280 affects auth0.js. Severity is high (CVSS 7.1). 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 t

How urgent is CVE-2026-42280?

Priority 28/100. High severity

Software pages

Auth0 vulnerabilities

References

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