json-jwt Gem 1.16.3 on Ruby JSON::JWT.decode access control

Summaryinfo

A vulnerability classified as problematic has been found in json-jwt Gem 1.16.3 on Ruby. Affected is the function JSON::JWT.decode. The manipulation leads to an unknown weakness. This vulnerability is uniquely identified as CVE-2023-51774. No exploit exists.

Detailsinfo

A vulnerability was found in json-jwt Gem 1.16.3 on Ruby (Ruby Gem) and classified as problematic. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is integrity. The summary by CVE is:

The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

The weakness was disclosed 12/25/2023. The advisory is shared at github.com. The identification of this vulnerability is CVE-2023-51774. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 213542 (openSUSE 15 Security Update : rubygem-json-jwt (openSUSE-SU-2025:0004-1)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (213542). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Ruby Gem

Name

• json-jwt Gem

Version

• 1.16.3

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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