CVE-2022-23540: AUTH0 Jsonwebtoken

High severity, CVSS 7.6. EPSS: 0.6% chance of exploitation in the next 30 days.

In versions `<=8.5.1` of `jsonwebtoken` library, lack of algorithm definition in the `jwt.verify()` function can lead to signature validation bypass due to defaulting to the `none` algorithm for signature verification. Users are affected if you do not specify algorithms in the `jwt.verify()` function. This issue has been fixed, please update to version 9.0.0 which removes the default support for the none algorithm in the `jwt.verify()` method. There will be no impact, if you update to version 9.0.0 and you don’t need to allow for the `none` algorithm. If you need 'none' algorithm, you have to explicitly specify that in `jwt.verify()` options.

Affected products

• AUTH0 Jsonwebtoken: up to and including 8.5.1

Published 2022-12-22. Last modified 2026-06-17.