CVE-2022-23540 MEDIUM

CVE-2022-23540: jsonwebtoken vulnerable to signature validation bypass due to insecure default algorithm in jwt.verify()

Vendor Auth0
Product node-jsonwebtoken
Weakness CWE-287 · Improper authentication
Published December 22, 2022
Last update February 13, 2025

CVSS base score

6.4/10
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

December 22, 2022 CVE published
February 13, 2025 Record updated