# CVE-2026-107371: auth0.js missing auth_time claim validation

Source: https://junglewise.ai/threats/cve-2026-107371-when-the-authorize-method-is-called-with-a-maxage-parameter-the  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-107371 · Severity: medium · CVSS 5.4 · Published 2026-10-13

The auth0.js library, which handles authentication and authorization for web applications, fails to validate the age of user authentication sessions. When an application requests a fresh login (maxAge parameter), the library may accept an older authentication token, allowing users to bypass freshness requirements and potentially access sensitive resources that should require re-authentication.

Vendors: [Auth0](https://junglewise.ai/threats/vendors/auth0).

## Quick answers

**Is CVE-2026-107371 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-107371 being exploited in the wild.

**How severe is CVE-2026-107371?** Medium severity, with a CVSS score of 5.4, published 13 October 2026.

**Which products and versions are affected?** Auth0.Js 9.12.0 through 10.2.1.

**Is there a fix for CVE-2026-107371?** Yes: fixed in 10.3.0 or greater. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-107371 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-107371?** Check whether you run Auth0.Js at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 10.3.0 or greater

## Technical details

The authorize() method does not validate the auth_time claim in ID tokens against the requested maxAge parameter, allowing authentication events older than the maximum age to be accepted. This is a missing claim validation issue (CWE-613) that requires the application to explicitly pass a maxAge value and the user's existing authentication to exceed that threshold. An attacker with the ability to reuse old session credentials can bypass freshness checks.

## Affected products

- Auth0 auth0.js 9.12.0 through 10.2.1

## Timeline

- 2026-10-13: disclosed

## References

- [https://github.com/auth0/auth0.js/security/advisories/GHSA-42v6-5rcc-mq4v](https://github.com/auth0/auth0.js/security/advisories/GHSA-42v6-5rcc-mq4v)
- [https://trust.okta.com/security-advisories/missing-verification-of-auth_time-claim-in-auth0-js-cve-2026-107371](https://trust.okta.com/security-advisories/missing-verification-of-auth_time-claim-in-auth0-js-cve-2026-107371)